PU Resource Thread

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PU Speed Tiers:

Stat / Pokemon / Base / Nature / EVs / Boost


Ani586MS5.gif
Tier 0 - Higher than Neutral Base 160 (420 and higher)

578 / Leafeon, Sawsbuck / 95 / Neutral / 252 / +2
538 / Articuno, Golduck / 85 / Neutral / 252 / +2
518 / Stoutland / 80 / Neutral / 252 / +2
498 / Kingler / 75 / Neutral / 252 / +2
496 / Simipour / 101 / +Spe / 252 / +1
493 / Floatzel / 115 / Neutral / 252 / +1
492 / Dodrio, Ninetales / 100 / +Spe / 252 / +1
475 / Leafeon, Sawsbuck / 95 / +Spe / 252 / +1
468 / Venipede / 57 / +Spe / 252 / +2
463 / Chatot / 91 / +Spe / 252 / +1
460 / Ninjask / 160 / +Spe / 252 / 0
459 / Mr. Mime / 90 / +Spe / 252 / +1
447 / Rotom-F / 86 / +Spe / 252 / +1
430 / Monferno / 81 / +Spe / 252 / +1
420 / Chatot / 91 / Neutral / 252 / +1
Ani291MS5.gif
Tier 1 - Max Base 100 to Neutral Base 160 (419-329)

419 / Ninjask / 160 / Neutral / 252 / 0
418 / Relicanth, Weepinbell / 55 / Neutral / 252 / +2
416 / Electrode / 140 / +Spe / 0
406 / Gorebyss, Huntail / 52 / Neutral / 252 / +2
398 / Beartic, Regice / 50 / Neutral / 252 / +2
384 / Fraxure / 67 / +Spe / 252 / +1
379 / Electrode / 140 / Neutral / 252 / 0
364 / Zebstrika / 116 / +Spe / 252 / 0
361 / Floatzel / 115 / +Spe / 252 / 0
355 / Purugly / 112 / +Spe / 252 / 0
351 / Venipede / 57 / +Spe / 252 / +1
350 / Jumpluff, Raichu / 110 / +Spe / 252 / 0
343 / Ursaring / 55 / +Spe / 252 / +1
339 / Kadabra, Rapidash / 105 / +Spe / 252 / 0
338 / Kadabra (Hidden Power Fighting) / 105 / +Spe / 252 / 0
331 / Simipour, Simisage, Simisear / 101 / +Spe / 252 / 0

Ani085MS5.gif
Tier 2 - Max Base 80 to Max Base 100 (328-298)


328 / Dodrio, Ninetales / 100 / +Spe / 252 / 0
326 / Gourgeist-S / 99 / +Spe / 252 / 0
324 / Basculin, Swanna / 98 / +Spe / 252 / 0
317 / Leafeon, Sawsbuck / 95 / +Spe / 252 / 0
311 / Leavanny / 92 / +Spe / 252 / 0
309 / Chatot, Murkrow / 91 / +Spe / 252 / 0
306 / Mr. Mime / 90 / +Spe / 252 / 0
298 / Rotom-F, Rotom-S / 86 / +Spe / 252 / 0

Ani200MS5.gif
Tier 3 - Neutral Base 70 to Max Base 85 (295-239)


295 / Articuno, Misdreavus / 85 / +Spe / 252 / 0
289 / Leafeon, Sawsbuck / 95 / Neutral / 252 / 0
289 / Gabite / 82 / +Spe / 252 / 0
287 / Monferno / 81 / +Spe / 252 / 0
284 / Arbok, Glalie, Grumpig / 80 / +Spe / 252 / 0
273 / Smeargle / 75 / +Spe / 252 / 0
272 / Klang / 50 / Neutral / 0 / +2
269 / Articuno, Golduck / 85 / Neutral / 252 / 0
261 / Monferno / 81 / Neutral / 252 / 0
259 / Altaria, Arbok, Stoutland / 80 / Neutral / 252 / 0
256 / Fraxure / 67 / +Spe / 252 / 0
249 / Kingler / 75 / Neutral / 252 / 0
244 / Meowstic-M / 104 / Neutral / 0 / 0

Ani262MS5.gif
Tier 4 - Min Base 70 to Neutral Base 70 (239-177)

239 / Mightyena / 70 / Neutral / 252 / 0
236 / Rampardos / 58 / +Spe / 252 / 0
234 / Quilladin, Venipede / 57 / +Spe / 252 / 0
229 / Ursaring / 55 / +Spe / 252 / 0
219 / Pawniard / 60 / Neutral / 252 / 0
213 / Quilladin / 57 / Neutral / 252 / 0
209 / Relicanth, Weepinbell / 55 / Neutral / 252 / 0
206 / Misdreavus / 85 / Neutral / 0 / 0
203 / Gorebyss, Huntail / 52 / Neutral / 252 / 0
200 / Gabite / 82 / Neutral / 0 / 0
199 / Beartic, Regice / 50 / Neutral / 252 / 0
196 / Altaria, Grumpig / 80 / Neutral / 0 / 0
189 / Armaldo, Golem / 45 / Neutral / 252 / 0

Ani186MS5.gif
Tier 5 - Min Base 50 to Min Base 70 (176-137)

176 / Politoed, Solrock, Vibrava / 70 / Neutral / 0 / 0
172 / Gogoat, Seaking / 68 / Neutral / 0 / 0
166 / Pelipper, Roselia / 65 / Neutral / 0 / 0
157 / Volbeat (0 IV) / 85 / -Spe / 0 / 0
156 / Tangela, Vullaby / 60 / Neutral / 0 / 0
150 / Quilladin / 57 / Neutral / 0 / 0
146 / Bouffalant, Relicanth / 55 / Neutral / 0 / 0
144 / Gourgeist-XL / 54 / Neutral / 0 / 0

Ani531MS5.gif
Tier 6 - Min Base 50 and lower (136 and lower)

136 / Audino, Klang, Mawile, Metang, Muk, Prinplup, Regice / 50 / Neutral / 0 / 0
126 / Armaldo, Dusknoir, Golem, / 45 / Neutral / 0 / 0
116 / Camerupt, Probopass / 40 / Neutral / 0 / 0
106 / Clefairy / 35 / Neutral / 0 / 0
100 / Hippopotas, Stunfisk / 32 / Neutral / 0 / 0
96 / Duosion / 30 / Neutral / 0 / 0
92 / Avalugg / 28 / Neutral / 0 / 0
56 / Trapinch / 10 / Neutral / 0 / 0
 
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PU Role Compendium:

Stealth Rock:
076.png
618.png
369.png
476.png
558.png
035.png
444.png
375.png
323.png
624.png
391.png
338.png
348.png
449.png
prinplup.png
303.png
235.png

Spikes:
315.png
543.png
651.png
558.png
235.png


Toxic Spikes:
315.png
543.png
235.png


Sticky Web:
542.png
235.png


Hazard Removal:
629.png
581.png
329.png
348.png
cryogonal.png
prinplup.png
lumineon.png
279.png


Wish:
531.png


Heal Bell / Aromatherapy:
531.png
326.png
334.png


U-turn / Volt Switch / Baton Pass:
523.png
189.png
419.png
101.png
476.png
291.png
479f.png
122.png
586.png
629.png
441.png
470.png
391.png
329.png
313.png
432.png
368.png
lumineon.png
303.png
279.png
479s.png


Normal Checks:
375.png
369.png
711.png
114.png
600.png
338.png
624.png
348.png
200.png
476.png
076.png
391.png
618.png
477.png
651.png
558.png
303.png


Water Checks:
315.png
531.png
186.png
673.png
114.png
332.png
369.png
035.png
523.png
101.png
479f.png
651.png
189.png
326.png
026.png
512.png
586.png
lumineon.png
279.png
131.png


Electric Checks:
618.png
323.png
119.png
328.png
531.png
315.png
035.png
326.png
634.png
076.png
673.png
449.png
089.png
444.png


Fighting (Monferno) Checks:
064.png
085.png
326.png
122.png
024.png
334.png
581.png
035.png
578.png
279.png
479s.png


Ground Checks:
470.png
512.png
479f.png
419.png
711.png
189.png
394.png
629.png
114.png
651.png
673.png
329.png
581.png
516.png
332.png


Fire Checks:
326.png
334.png
531.png
323.png
419.png
035.png
634.png
550.png
444.png
329.png
516.png
078.png
618.png
476.png
611.png
186.png
279.png


Revenge Killers:
064.png
419.png
122.png
586.png
516.png
085.png
432.png
479f.png
101.png
441.png
291.png
391.png


Stallbreakers / Wallbreakers:
508.png
512.png
419.png
085.png
516.png
026.png
217.png
441.png
368.png
578.png
200.png
514.png
391.png
634.png
122.png
332.png
303.png
089.png
606.png
131.png


Priority Users:
332.png
624.png
419.png
085.png
262.png
198.png
076.png
432.png
391.png
550.png
375.png
367.png
477.png
024.png
303.png
089.png


Weather Sweepers:
508.png
055.png
419.png
586.png
368.png
470.png
348.png


Weather Setters:

313.png
449.png
369.png
076.png
101.png


Setup Sweepers:

Swords Dance:

470.png
391.png
332.png
624.png
303.png
189.png
626.png
217.png
586.png
463.png


Calm Mind:
578.png
035.png
326.png


Agility / Rock Polish:
378.png
369.png
144.png
099.png
119.png


Nasty Plot:
516.png
026.png
200.png
038.png
514.png
512.png
122.png


Shell Smash:
368.png
367.png
558.png


Bulk Up:
673.png
419.png


Dragon Dance:
611.png
334.png


Other Sweepers:
262.png
024.png
055.png
600.png
419.png
089.png
426.png

 
Last edited:
1501c915a2.png

Art by bummer
PU Sets Viability Rankings

S-Rank

419.png
Floatzel
(Specially Based Mixed: S)
(Physically Based Mixed: S)
(Physical Attacker: A+)
(Special Attacker: A+)

479f.png
Rotom-F
(Choice Scarf: S)
(Substitute Will-o-Wisp: A+)
(SubSplit: A)

332.png
Cacturne
(Specially Based Mixed: S)
(Swords Dance: A+)
(Physically Based Mixed: A)
(Nasty Plot: B)

A-Rank
A+
470.png
Leafeon
(Choice Band: A+)
(Swords Dance: A+)
(Choice Scarf: B)


391.png
Monferno
(Swords Dance: A+)
(All-out Attacker: A+)
(Choice Scarf: B)
(Choice Band: B)

076.png
Golem
(Weakness Policy Lead: A+)
(Specially Defensive: A+)
(Custap Lead: A+)
(Tank A)

122.png
Mr. Mime
(Choice Scarf: A+)
(Nasty Plot: A+)
(Choice Specs: A)
(Life Orb Attacker: B+)

326.png
Grumpig
(Offensive Utility: A+)
(Offensive Calm Mind: A+)
(Specially Defensive: A-)

508.png
Stoutland
(Choice Band: A+)
(Sand Sweeper: A-)


A
315.png
Roselia
(Specially Defensive: A)
(Offensive: A)

618.png
Stunfisk
(Physically Defensive: A)
(Specially Defensive: A-)

523.png
Zebstrika
(Life Orb Attacker: A)

624.png
Pawniard
(Swords Dance: A)
(All-out Attacker: B+)

085.png
Dodrio
(Choice Band: A)
(Choice Scarf: A-)

378.png
Regice
(Rock Polish: A)
(Tank: B)

629.png
Vullaby
(Physically Defensive: A)
(Specially Defensive: A-)

441.png
Chatot
(Choice Scarf: A)
(Choice Specs: A-)
(Nasty Plot: B)

369.png
Relicanth
(Offensive Stealth Rock: A)
(Defensive Stealth Rock: A-)
(Choice Band: A-)
(Rock Polish: A-)

303.png
Mawile
(Swords Dance: A)
(Defensive: A)
(All-out Attacker: A)

711.png
Gourgeist-XL
(Physically Defensive: A)
(Offensive: B-)

189.png
Jumpluff
(Swords Dance: A)
(Utility Attacker: A)

581.png
Swanna
(Offensive Defog: A)
(Defensive Defog: B)

375.png
Metang
(Offensive Stealth Rock: A)
(Defensive Stealth Rock: A)

516.png
Simipour
(All-out Attacker: A)
(Choice Scarf: A-)
(SubSalac Nasty Plot: A-)
(Life Orb Nasty Plot: B+)


A-
512.png
Simisage
(All-out Attacker: A-)
(Life Orb Nasty Plot: A-)
(Choice Scarf: B+)

024.png
Arbok
(Offensive Coil: A-)
(Defensive Coil: C+)

089.png
Muk
(Choice Band: A-)
(CroMuk: A-)
(Assault Vest: B+)

101.png
Electrode
(Life Orb Attacker: A-)
(Choice Specs: A-)

531.png
Audino
(Specially Defensive Pivot: A-)
(Offensive D)

064.png
Kadabra
(Focus Sash: A-)
(Life Orb: A-)

186.png
Politoed
(Tank: A-)
(Specially Defensive: B+)
(Choice Scarf: B)

144.png
Articuno
(Substitute Attacker: A-)
(3 Attacks + Roost: A-)
(Agility: B+)

558.png
Crustle
(Custap Lead: A-)
(Shell Smash: B)
(Defensive: C+)

615.png
Cryogonal
(Offensive Rapid Spin: A-)
(Defensive Rapid Spin: A-)

626.png
Bouffalant
(Sub Swords Dance: A-)
(Assault Vest: A-)
(Choice Band: B)
(Stallbreaker: B)

026.png
Raichu
(Nasty Plot: A-)
(All-out Attacker: B+)
(Choice Scarf: B+)

035.png
Clefairy
(Calm Mind: A-)
(Specially Defensive: A-)

477.png
Dusknoir
(Life Orb Attacker: A-)
(Choice Band: A-)
(Spell Tag: B+)
(Defensive: C)

651.png
Quilladin
(Offensive Spikes: A-)
(Defensive Spikes: A-)

114.png
Tangela
(Offensive Pivot: A-)
(Defensive Pivot: B+)

476.png
Probopass
(Offensive Stealth Rock: A-)
(Defensive Stealth Rock: B)

217.png
Ursaring
(Quick Feet: A-)
(Guts: D)

B-Rank


B+
235.png
Smeargle
(Entry Hazard Lead: B+)
(Baton Pass: C-)

291.png
Ninjask
(Choice Band: B+)
(Swords Dance: B)
(SpeedPass: C)

198.png
Murkrow
(All-out Attacker: B+)

479s.png
Rotom-S
(Offensive Utility: B+)
(Choice Scarf: C+)

200.png
Misdreavus
(Nasty Plot: B+)
(Defensive: B)

078.png
Rapidash
(Utility Attacker: B+)
(Choice Band: B)
(Choice Scarf: B-)

334.png
Altaria
(Special Attacker: B+)
(Offensive Dragon Dance: B)
(Defensive: B)
(Defensive Dragon Dance: B-)

444.png
Gabite
(Defensive Stealth Rock: B+)
(Offensive Stealth Rock: B+)
(Choice Scarf: B-)

578.png
Duosion
(Standard Calm Mind: B+)
(Acid Armour Calm Mind: B+)

367.png
Huntail
(Shell Smash: B+)
(Coil Pass: C)

514.png
Simisear
(All-out Attacker: B+)
(Life Orb Nasty Plot: B)

279.png
Pelipper
(Defensive Defog: B+)
(Offensive: C+)

606.png
Beheeyem
(Offensive Trick Room: B+)
(Choice Specs: B)
(Calm Mind: B)
(Assault Vest: C)

611.png
Fraxure
(Dragon Dance: B+)
(Swords Dance: B)

038.png
Ninetales
(Nasty Plot: B+)
(Specially Defensive: C)

323.png
Camerupt
(Specially Defensive B+)
(Choice Specs: C)

B
550.png
Basculin
(Mixed Attacker: B)
(Choice Band: B)

426.png
Drifblim
(Acroblim: B)
(Calm Mind: C)

673.png
Gogoat
(Defensive Bulk Up: B)
(Special Attacker: B-)
(Offensive Bulk Up: C)

055.png
Golduck
(Rain Sweeper: B)
(Calm Mind: C)

368.png
Gorebyss
(Shell Smash: B)
(Choice Specs: C-)

711.png
Gourgeist-S
(Subseed: B)
(Offensive: C)

449.png
Hippopotas
(Sand Support: B)
(Defensive: C)

131.png
Lapras
(Choice Specs: B)
(Special Attacker: B-)
(Dragon Dance: D)

542.png
Leavanny
(Sticky Web Lead: B)
(Choice Scarf: C-)

457.png
Lumineon
(Defensive Defog Pivot: B)

262.png
Mightyena
(Moxie Cleaner: B)

394.png
Prinplup
(Defensive Utility: B)

432.png
Purugly
(Defiant Attacker: B)

338.png
Solrock
(Defensive Stealth Rock: B)
(Cosmic Power Pass: C)
(Rock Polish: D)


B-
348.png
Armaldo
(Tank Utility: B-)
(Offensive Utility: B-)
(Rock Polish: C)

170.png
Chinchou
(Specially Defensive: B-)

125.png
Electabuzz
(Eviolite Attacker: B-)
(Choice Scarf: C-)

099.png
Kingler
(Mixed Agility: B-)
(Dual Dance: C+)
(Choice Band: C-)

600.png
Klang
(Restalk Shift Gear: B-)
(Offensive Shift Gear: C)

586.png
Sawsbuck
(Choice Scarf: B-)
(Sun Sweeper: C+)
(Swords Dance: C+)

119.png
Seaking
(Offensive Lightning Rod: B-)

313.png
Volbeat
(Weather Setter: B-)
(Tail Glow BP: C+)


C-Rank


C+
713.png
Avalugg
(Specially Defensive: C+)

614.png
Beartic
(Rain Sweeper: C+)

552.png
Krokorok
(Offensive Stealth Rock: C+)

105.png
Marowak
(Offensive Stealth Rock: C+)
(Substitute Attacker: C+)

678.png
Meowstic-M
(Screen Setter: C+)

409.png
Rampardos
(Life Orb Wallbrear: C+)
(Choice Scarf: C+)
(Lead: C+)
(Rock Polish: C-)

486.png
Regigigas
(Substitute Tank: C+)

328.png
Trapinch
(Specially Defensive Trapper: C+)

543.png
Venipede
(Lead Spiker: C+)

329.png
Vibrava
(Specially Defensive Defog: C+)

634.png
Zweilous
(Choice Band: C+)
(Specially Defensive: C-)

C
012.png
Butterfree
(Quiver Dance Sweeper: C)
(Lead: C)
703.png
Carbink
(Calm Mind Restalk: C)

356.png
Dusclops
(Calm Mind: C)
(Mixed Wall: C)

362.png
Glalie
(Lead Spiker: C)
(Offensive Spikes: C)

405.png
Luxray
(Choice Band: C)
(Assault Vest: C-)

446.png
Munchlax
(Restalk Curse: C)

070.png
Weepinbell
(Sun Sweeper: C)

C-
181.png
Ampharos
(Offensive Tank: C-)

354.png
Banette
(Life Orb Attacker: C-)

676.png
Furfrou
(Offensive Pivot: C-)

471.png
Glaceon
(Choice Specs: C-)

097.png
Hypno
(WishPass: C-)
(NastyPass: C-)

463.png
Lickilicky
(Specially Defensive: D)
(Swords Dance: D)

428.png
Lopunny
(Cosmic Power Pass: C-)
(Choice Scarf: D)
(Offensive: D)

292.png
Shedinja
(Swords Dance: C-)
(Pivot: C-)

528.png
Swoobat
(SubSalac Calm Mind: C-)
(Kee Berry Calm Mind: D)

317.png
Swalot
(Defensive: C-)

324.png
Torkoal
(Defensive: C-)
(Offensive Shell Smash: D)

584.png
Vanilluxe
(Autotomize: C-)
(All-out Attacker: C-)

008.png
Wartortle
(Defensive Rapid Spin: C-)

040.png
Wigglytuff
(Competitive Stealth Rocks: C-)

D-Rank

132.png
Ditto
(Choice Scarf Imposter: D)

608.png
Lampent
(Offensive Tank: D)

619.png
Mienfoo
(Calm Mind Pass: D)
(Bulk Up Pass: D)

177.png
Natu
(Shedinja Teammate: D)

559.png
Scraggy
(Defensive Bulk Up: D)

336.png
Seviper
(All-out Attacker: D)

079.png
Slowpoke
(Defensive Tank: D)
 
Last edited:
pu_checks_compendium_by_dunnyct-d9wu75m.png

Art by D_what

PU Checks Compendium

Following the same basic idea as the other teambuilding compendiums found throughout the OU sub-forum, the basic goal of this thread is to provide a visual tool to assist teambuilding by giving players a quick way to pick checks and counters for the metagame's top threats. Basically, a "check" as defined here is anything that reliably beats a threat, and they're separated in this list by whether or not they can switch in. The Pokemon will be listed by sprites rather than name for the sake of easy and quick reference, and they will be organized in descending order of viability ranking. As I want this to be a community-built resource, I encourage everyone to suggest changes as you see fit. Here are a few guidelines that explain how this compendium will be organized (subject to change):
  • The only mons which I made sections for are c+ and above, however i removed some less seen ones.
  • For the checks, I mostly did up to c+, however I may have included some more viable ones from below for GSI and SSI if they are particularly good checks, or if there werent many other checks in the sections
  • I will not add/remove checks if certain pokes rise/drop on the viability rankings (unless ofc they move down from higher tiers)
  • I've also started with offensive threats since these are the ones that players generally need the most help keeping in check (this includes slow boosting sweepers). Also certain offensive Pokemon I did not do as they aren't teambuilding relevant, for example Probopass.
  • The checks are generally in decreasing viability (most viable at the start), obviously this is subjective and not perfect so dont tell me to change the orders lol
  • I only consider fairly standard and common sets when talking about both the threats and their checks.
  • You can suggest changes as it is probably not all correct. However, be polite about it, we put a lot of work into doing this. If your change does not go through, don't repost it as most likely I would have disagreed with it.
  • I would prefer it if you only suggested big changes (like adding Pokemon from not being there to SSI/GSI), and remember that SSI is really subjective. Lastly, do not suggest unranked or e/d-ranks or your post will be completely ignored
There are three categories that the checks will be divided into for each entry.
  • Guaranteed Switch-Ins (GSI): These Pokemon can switch into basically anything a threat can throw at them and win the matchup, within reason. This often means switching in on more than one set, for example Floatzel can run choice band and choice specs, so lacks a guaranteed switch in. When evaluating which moves a check must be able to switch into, I have used what I think is good enough to be standard, but obviously that is subjective.

  • Situational Switch-Ins (SSI): These Pokemon can switch in safely under certain circumstances, but not always. Pokemon in this category can either switch safely into some variants of a threat but struggle against others, or they struggle with common coverage moves but can at least switch into a threat's STABs and other moves commonly used on switches (such as boosting moves and Knock Off) and win the matchup. This is somewhat of a "gray area" category, so there's a bit of flexibility here.

  • Non-Switch-Ins (NSI): These Pokemon cannot switch safely into a certain threat, generally because they are beaten by one of the threat's STABs, lose if they switch in on a boosting move, etc. Pokemon in this category can, however, defeat a threat in a 1-on-1 matchup. This includes faster revenge killers, as well as Pokemon that can take a single hit and KO back.
There might be exceptions to the above rules, so these will be handled on a case-by-case basis. My advice for using this compendium is to take a look at the PU Viability Rankings and make sure that you have an answer to the highest ranked threats first, since these are generally going to be some of the most dangerous and common threats and as such are high priority when teambuilding. Once you have those covered, then you can more comfortably prepare for the lower ranked threats. Also, don't worry about having a GSI for everything; that's basically impossible given how many threats there are an how hard it is to fully counter some of them. Instead, try to at least have an SSI for the top threats so that you'll have something that you can throw in front of them somewhat reliably. More offensive teams can probably make do with a couple of NSIs and proper offensive pressure. Bottom line is that you shouldn't get too carried away with trying to have perfect counters for everything, but this compendium should give you a wide range of checks to choose from so that you can build until you feel you can cover what you need to between team synergy and in-game decision making.

Remember to read the entire OP before posting!

If you want a more interactive version use this: http://hidden50.github.io/brmt/
 
Last edited by a moderator:
334.png
Altaria Checks
GSI:
035.png

SSI:
076.png
531.png
378.png
629.png
369.png
375.png
186.png
711.png

NSI:
479f.png
419.png
523.png
122.png
516.png
615.png
508.png
626.png
101.png
026.png


024.png
Arbok Checks
GSI:
618.png
200.png
444.png
713.png
356.png

SSI:
476.png
024.png
076.png
711.png
600.png
375.png
369.png
348.png
477.png
449.png
338.png
329.png

NSI:
419.png
516.png
064.png
026.png
217.png
441.png
105.png



348.png
Armaldo Checks
GSI:
369.png

SSI:
114.png
618.png
067.png
200.png
711.png
444.png
600.png

NSI:
419.png
516.png
026.png
512.png
038.png
024.png
055.png
186.png
514.png
581.png
550.png


144.png
Articuno Checks
GSI:
476.png
479f.png
600.png
375.png

SSI:
378.png
326.png
038.png
531.png
125.png
446.png

NSI:
085.png
508.png
523.png
078.png
026.png
217.png
512.png
038.png
514.png
405.png


550.png
Basculin Checks
GSI:
369.png
713.png
186.png
131.png

SSI:
315.png
114.png
711.png
470.png
673.png
651.png
634.png

NSI:
419.png
085.png
523.png
516.png
189.png
064.png
026.png
217.png
586.png
512.png
479f.png
125.png
496.png


614.png
Beartic Checks (in rain)
GSI:
375.png

SSI:
326.png
186.png
369.png
713.png
324.png

NSI:
419.png
064.png
067.png
055.png
391.png
291.png
348.png
367.png
338.png


606.png
Beheeyem Checks
GSI:
531.png
375.png
629.png

SSI:
326.png
378.png
476.png
200.png
600.png
634.png

NSI:
085.png
508.png
516.png
189.png
078.png
217.png
512.png
262.png
441.png
291.png
470.png
550.png
477.png


626.png
Bouffalant Checks
GSI:
200.png
711.png
338.png

SSI:
067.png
369.png
629.png
477.png
426.png

NSI:
419.png
508.png
085.png
078.png
516.png
217.png
391.png
198.png
550.png


441.png
Chatot Checks
GSI:
122.png
200.png
477.png
356.png

SSI:
618.png
378.png
476.png
711.png
463.png
600.png
375.png
369.png

NSI:
419.png
085.png
523.png
516.png
064.png
078.png
026.png
514.png
550.png
125.png


035.png
Clefairy Checks (calm mind)
GSI:
600.png
375.png
531.png

SSI:
315.png
326.png
038.png
024.png
200.png
186.png

NSI:
419.png
085.png
508.png
064.png
217.png
512.png
076.png
550.png
099.png
105.png


615.png
Cryogonal Checks
GSI:
326.png
531.png
378.png
375.png

SSI:
067.png
391.png
626.png
144.png
600.png
038.png

NSI:
419.png
624.png
189.png
217.png
508.png
078.png
477.png
514.png
432.png



085.png
Dodrio Checks
GSI:
618.png
476.png
076.png
369.png
713.png

SSI:
444.png
600.png
375.png
338.png
125.png
405.png

NSI:
419.png
523.png
516.png
064.png
078.png
026.png
479f.png
514.png
432.png


578.png
Duosion Checks
GSI:
326.png
200.png
600.png

SSI:
476.png
531.png
186.png
634.png
629.png

NSI:
508.png
064.png
078.png
217.png
262.png
550.png
477.png
348.png


477.png
Dusknoir Checks
GSI:
634.png

SSI:
508.png
114.png
067.png
217.png
076.png
279.png
369.png
629.png
713.png

NSI:
419.png
085.png
516.png
026.png
512.png
262.png
200.png
550.png


125.png
Electabuzz Checks
GSI:
315.png
326.png
618.png
035.png
531.png
711.png
673.png
449.png

SSI:
114.png
067.png
378.png
200.png

NSI:
419.png
508.png
078.png
217.png
611.png
470.png


419.png
Floatzel Checks
GSI:
SSI:
315.png
114.png
326.png
035.png
711.png
531.png
186.png
369.png
651.png
131.png

NSI:
523.png
516.png
067.png
378.png
586.png
144.png
673.png
125.png
291.png


611.png
Fraxure Checks
GSI:
114.png
375.png

SSI:
618.png
200.png
035.png
711.png
076.png
369.png
651.png
338.png
713.png

NSI:
516.png
064.png
067.png
122.png
479f.png
291.png

673.png
Gogoat Checks
GSI:
189.png
114.png
711.png

SSI:
315.png
200.png
479f.png
144.png
629.png
634.png
713.png

NSI:
085.png
516.png
064.png
078.png
378.png
038.png
024.png
581.png
391.png
291.png


055.png
Golduck Checks
GSI:
186.png
531.png
131.png

SSI:
315.png
326.png
378.png
035.png
634.png
673.png

NSI:
419.png
516.png
064.png
067.png
144.png
313.png
125.png
262.png


076.png
Golem Checks
GSI:
114.png
711.png
651.png
338.png

SSI:
315.png
200.png
470.png
673.png
329.png

NSI:
419.png
516.png
189.png
508.png
067.png
512.png
586.png
055.png
186.png
550.png


368.png
Gorebyss Checks
GSI:
315.png
186.png
131.png

SSI:
326.png
626.png
035.png
531.png
673.png

NSI:
064.png
378.png
516.png
586.png
479f.png
441.png


326.png
Grumpig Checks
GSI:
531.png
375.png
629.png
634.png

SSI:
618.png
200.png
035.png
711.png
446.png

NSI:
085.png
508.png
189.png
217.png
512.png
586.png
262.png
550.png
477.png


367.png
Huntail Checks
GSI:
315.png
186.png
711.png

SSI:
200.png
279.png
375.png
673.png
629.png
634.png
713.png

NSI:
516.png
064.png
067.png
586.png
479f.png
125.png


189.png
Jumpluff Checks
GSI:
523.png
375.png
600.png
125.png
713.png

SSI:
618.png
114.png
200.png
476.png
024.png
144.png
711.png
444.png
629.png
634.png

NSI:
419.png
508.png
078.png
026.png
611.png
479f.png
291.png
432.png


064.png
Kadabra Checks
GSI:
531.png
629.png
600.png

SSI:
618.png
326.png
378.png
200.png
035.png
186.png
375.png
634.png
097.png

NSI:
419.png
508.png
523.png
516.png
217.png
026.png
262.png
432.png
477.png


099.png
Kingler Checks
GSI:
114.png
651.png

SSI:
369.png
711.png
186.png
629.png
673.png
470.png

NSI:
419.png
516.png
085.png
189.png
064.png
512.png
586.png
405.png


600.png
Klang Checks
GSI:
618.png
444.png
324.png

SSI:
078.png
114.png
067.png
200.png
476.png
186.png
375.png
552.png

NSI:
419.png
516.png
523.png
026.png
038.png
514.png
391.png
105.png


470.png
Leafeon Checks
GSI:
114.png
629.png
713.png

SSI:
189.png
078.png
024.png
391.png
651.png

NSI:
419.png
085.png
523.png
516.png
217.png
038.png
514.png
581.png
291.png


463.png
Lickilicky Checks
GSI:
713.png

SSI:
114.png
067.png
200.png
076.png
711.png
369.png
444.png
634.png
338.png

NSI:
419.png
085.png
508.png
516.png
026.png
217.png
024.png
550.png
391.png
 
Last edited by a moderator:
262.png
Mightyena Checks
GSI:
618.png
114.png
369.png
600.png
449.png
651.png

SSI:
476.png
076.png
444.png
391.png
713.png
676.png

NSI:
189.png
038.png
078.png


200.png
Misdreavus Checks
GSI:
531.png
634.png

SSI:
315.png
508.png
038.png
078.png
378.png
629.png

NSI:
085.png
516.png
512.png
514.png
262.png
470.png
432.png
099.png


391.png
Monferno Checks
GSI:
618.png
449.png

SSI:
326.png
578.png
035.png
200.png
444.png
629.png
477.png

NSI:
419.png
516.png
085.png
189.png
067.png
078.png
122.png
024.png
055.png
581.png
338.png


122.png
Mr. Meme Checks
GSI:
375.png
200.png
477.png
356.png

SSI:
531.png
618.png
326.png
378.png
035.png
097.png

NSI:
508.png
085.png
186.png
600.png
262.png


198.png
Murkrow Checks
GSI:
618.png
600.png
703.png

SSI:
476.png
076.png
378.png
369.png
444.png
375.png
713.png
338.png

NSI:
479f.png
125.png


038.png
Ninetales Checks
GSI:
326.png
078.png
329.png
634.png

SSI:
067.png
611.png
476.png
531.png
444.png
618.png

NSI:
419.png
026.png
217.png
516.png
514.png
550.png
432.png


291.png
Ninjask Checks
GSI:
618.png
476.png
369.png
600.png
703.png

SSI:
076.png
444.png
713.png

NSI:
516.png
432.png
026.png
586.png
375.png


624.png
Pawniard Checks
GSI:
618.png
369.png

SSI:
067.png
391.png
114.png
476.png
444.png

NSI:
419.png
523.png
078.png
516.png
479f.png
038.png
186.png


432.png
Purugly Checks
GSI:
476.png
076.png
369.png
600.png
713.png

SSI:
618.png
114.png
375.png
200.png
711.png
477.png
444.png

NSI:
419.png
523.png
064.png
067.png
391.png
611.png


026.png
Raichu Checks
GSI:
315.png
618.png
673.png

SSI:
531.png
326.png
378.png
711.png
477.png

NSI:
419.png
523.png
432.png
064.png
067.png
378.png


078.png
Rapidash Checks
GSI:
444.png
369.png
338.png
076.png

SSI:
618.png
476.png
186.png
348.png

NSI:
419.png
026.png
523.png
064.png
067.png
550.png
326.png


378.png
Regice Checks
GSI:
326.png
375.png
035.png
097.png

SSI:
067.png
531.png
391.png
600.png

NSI:
508.png
078.png
217.png
064.png
038.png
514.png
348.png


369.png
Relicanth Checks
GSI:
114.png
711.png
651.png

SSI:
067.png
200.png
470.png
375.png
444.png

NSI:
419.png
523.png
516.png
064.png
026.png
479f.png
512.png


315.png
Roselia Checks
GSI:
326.png
024.png
531.png
375.png
600.png
629.png

SSI:
078.png
038.png
067.png
200.png
476.png
477.png
651.png

NSI:
419.png
085.png
508.png
217.png
189.png
122.png
144.png
391.png
514.png


479f.png
Rotom-F Checks
GSI:
531.png

SSI:
326.png
038.png
378.png
476.png
035.png
600.png
125.png

NSI:
523.png
078.png
217.png
026.png
067.png
514.png
391.png

586.png
Sawsbuck Checks
GSI:
114.png
711.png
629.png
600.png
375.png
713.png

SSI:
315.png
024.png
200.png
144.png

NSI:
085.png
523.png
189.png
064.png
067.png
078.png
038.png
514.png
291.png
391.png


516.png
Simipour Checks
GSI:
186.png

SSI:
315.png
326.png
531.png
035.png
673.png
629.png
634.png

NSI:
419.png
523.png
189.png
026.png
078.png
064.png
144.png
550.png
291.png
432.png


512.png
Simisage Checks
GSI:
317.png

SSI:
315.png
024.png
144.png
531.png
711.png
629.png

NSI:
419.png
523.png
085.png
189.png
064.png
078.png
217.png
514.png
291.png
432.png
391.png


514.png
Simisear Checks
GSI:
186.png

SSI:
078.png
391.png
326.png
531.png
444.png
329.png

NSI:
419.png
523.png
516.png
189.png
064.png
217.png
611.png
432.png
067.png


508.png
Stoutland Checks
GSI:
114.png

SSI:
618.png
476.png
369.png
076.png
375.png
600.png
338.png
348.png
713.png

NSI:
419.png
516.png
085.png
026.png
326.png
217.png
078.png
512.png
514.png
391.png
441.png


581.png
Swanna Checks
GSI:
378.png
531.png
186.png

SSI:
326.png
629.png
600.png
634.png
125.png
131.png

NSI:
419.png
085.png
523.png
516.png
064.png
078.png
217.png
512.png
479f.png


114.png
Tangela Checks
GSI:
315.png
378.png
711.png
629.png

SSI:
523.png
326.png
038.png
024.png
144.png
600.png
634.png

NSI:
419.png
085.png
516.png
078.png
479f.png
441.png
514.png
581.png


217.png
Ursaring Checks
GSI:
114.png

SSI:
618.png
200.png
711.png
369.png
713.png

NSI:
419.png
523.png
064.png
026.png
067.png
432.png
291.png
391.png


523.png
Zebstrika Checks
GSI:
618.png
315.png
326.png
531.png
328.png

SSI:
288.png
378.png
476.png
076.png
673.png
125.png
105.png

NSI:
508.png
026.png
067.png
611.png
038.png
291.png
432.png
477.png


634.png
Zweilous Checks
GSI:
SSI:
114.png
067.png
122.png
035.png
369.png
600.png
713.png

NSI:
419.png
085.png
508.png
516.png
217.png
479f.png
055.png
611.png
144.png
550.png
291.png
444.png
 
PU EV Spread Compendium

Hello everyone, and welcome to PU’s EV spread compendium. This thread is a resource designed to assist old and new players alike in choosing the optimal Effort Value spreads and natures for each Pokemon in PU.

All too often, I see players with a Ninjask that is only able to switch into Stealth Rock once or a Simipour that has failed to activate its Salac Berry after using Substitute. This resource sets out to inform players as to how to avoid making these sorts of mistakes when finishing EV spreads during the teambuilding process while simultaneously providing a forum wherein alternative, yet viable EV spreads and natures can be discussed.

In this thread, you may suggest alternate EV spreads and natures for Pokemon listed C+ and above. If the spread and nature you are suggesting is different than the standard, you must provide rationale for why these non-standard spreads are viable.

For example, most specially defensive Roselia builds currently run 166 Speed uninvested, so in an effort to outspeed both Solrock and Politoed and increase its effectiveness by not losing to either Zen Headbutt or Ice beam, respectively, I might suggest a more offensive Roselia spread with 208 HP / 252 SpA / 48 Spe EVs and a Modest nature. This extra Speed would allow Roselia to Giga Drain successfully on both these targets, which would constitute a post with sufficient rationale and would therefore be added to the compendium.

However, including additional spreads to speed creep these new EV spreads is discouraged (unless there is a specific target you are providing creep for), as speed creeping has to end at some point.

Always be sure to back up your argument with damage calculations (if applicable) or the speed of the Pokemon you are attempting to check or counter.

***Before re-posting standard EV spreads or creating new ones, be sure to check out these awesome resources first:

http://www.smogon.com/smog/issue2/saving_hp2
http://www.smogon.com/forums/threads/magic-number-of-hp.3456308/

^Both of these threads explain in which scenarios an odd number of HP would be superior, and when an even number would be superior.

http://www.smogon.com/forums/threads/a-beginners-guide-to-stat-distribution.3503580/

^Here's a nice overview written by Scorpdestroyer that includes EVs, IVs, natures and how to EV, generally speaking.

http://www.smogon.com/forums/threads/pu-speed-tiers-and-role-compendium.3553385/

^And finally, this comprehensive resource on speed tiers in PU should be your Bible when creating new EV spreads.

Edit: Huge shoutout to TONE114 for helping me the most among all the contributors listed above. Thanks a lot! :]

S Rank

Physical Floatzel

Floatzel @ Choice Band / Mystic Water / Life Orb
Ability: Water Veil
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
IVs: 29 HP (if Life Orb)

Special Floatzel

Floatzel @ Choice Specs / Mystic Water / Life Orb
Ability: Swift Swim
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP (if Life Orb) / 0 Atk / 30 SpA (if Hidden Power Grass)

Baton Pass Floatzel

Floatzel @ Leftovers
Ability: Water Veil
EVs: 248 HP / 8 SpD / 252 Spe
Jolly Nature / Timid Nature

Maximum Speed EVs and a Jolly or Timid nature are required to outspeed positive nature 252 Spe invested base 114s and lower, such as Timid 252 Spe Swoobat (359), Jolly 252 Spe Purugly (355), Jolly 252 Spe Jumpluff (350), Timid 252 Spe Raichu (350), etc.

On the Baton Pass set, maximum HP investment increases Floatzel's mixed bulk, allowing it to set up more easily before passing stat boosts, while minimizing damage taken from Stealth Rock and other passive sources via an odd HP number. The other sets also provide an odd number for the same reason.

The rest of its EVs are placed in Special Defense to help Floatzel take resisted hits such as Scald.

Mixed Floatzel

Floatzel @ Life Orb / Mystic Water
Ability: Water Veil
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
IVs: 29 HP (if Life Orb) / 30 SpA (if using Hidden Power Grass)

Like the other Floatzel sets above, this Floatzel is also ran with maximum Speed so that it can outspeed positive nature 252 spe base 110s, such as Raichu and Jumpluff (350).
However, unlike the others, this Floatzel runs a mixed set in order to bypass priority users in PU such as Sucker Punch Mightyena and Mach Punch Monferno, which means it should run a Naive nature here in order to maximize Aqua Jet's damage output.
Rather than placing its remaining 4 EVs in a defensive stat, they should be allocated toward its Attack stat for the same reason that it receives a Naive nature.
Finally, if Floatzel is using a Life Orb, its HP stat should be lowered to a digit ending in 9 so that Life Orb recoil can be reduced.

Running a mixed set with Life Orb over standard Choice Specs means that Floatzel will be dealing slightly less damage with its special set overall, which in turn necessitates hazard support such as Stealth Rock and Spikes for Floatzel. For example, without any hazards on Tangela's side of the field, Floatzel cannot OHKO Tangela with LO Ice Beam. Therefore, this Floatzel is most effective when hazards are in use and can be kept up through various means.

252 SpA Life Orb Floatzel Ice Beam vs. 248 HP / 8 SpD Eviolite Tangela: 255-302 (76.5 - 90.6%) -- guaranteed 2HKO

vs

252 SpA Choice Specs Floatzel Ice Beam vs. 248 HP / 8 SpD Eviolite Tangela: 294-348 (88.2 - 104.5%) -- guaranteed OHKO after Stealth Rock

Choice Scarf Floatzel

Floatzel @ Choice Scarf
Ability: Water Veil / Swift Swim
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
IVs: 0 Atk / 30 SpA (if using Hidden Power Grass)

Floatzel can pull off a Choice Scarf set well, given it reaches 493 Speed after the boost from Choice Scarf with a Modest nature, which is enough to outspeed Jolly 252 Spe Choice Scarf Dodrio (492) and everything slower. Running a Timid nature, while somewhat weak in comparison, lets you outspeed Modest 252 Spe Swift Swim Golduck in the rain (538) and Agility Articuno (538) by 3 points (541), so it has its uses on different teams.
However, using Swift Swim allows Floatzel to run Modest without the risk of being outsped by Golduck, so using a Timid nature is more or less a secondary option and is largely team dependent.
Its EVs are used to maximize its Special Attack and Speed, with the remaining 4 EVs being placed in either its Defense or Special Defense.
Choice Scarf Rotom-F

Rotom-Frost @ Choice Scarf
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk

Max speed Rotom-F outspeeds the majority of the PU meta with a Choice Scarf at 447 speed, including +2 Jolly / Naive 252 Spe Huntail (446), Adamant 252 Spe Ninjask (419), and everything below.
Maximum Special Attack investment with a Timid nature allows Rotom-F to deal as much damage as possible.
The remaining 4 EVs are placed into Defense rather than HP, in order to give it an odd number of HP so that it can switch into Stealth Rock one more time.

Substitute Rotom-F

Rotom-Frost @ Life Orb / Leftovers
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 29 HP (if Life Orb) / 0 Atk

Like Scarf Rotom-F, Substitute Rotom-F is also given an odd number of HP to minimize damage from Stealth Rock.
Life Orb gives Rotom-F just enough of an attack boost to allow it to wallbreak, while the recoil from LO and lowered HP makes Pain Split more effective on specially defensive walls with large HP pools, like Audino. Will-O-Wisp is a more common option on Substitute Rotom-F, however.
While optional, an HP IV of 29 can be used to bring Rotom-F's total HP to a digit ending in 9, thus minimizing Life Orb recoil as much as possible. However, if Leftovers are used, then dropping its HP IV to 29 would be unnecessary.

A+ Rank

Offensive Roselia

Roselia @ Eviolite
Ability: Natural Cure
EVs: 32 HP / 252 SpA / 224 Spe
*Alternative Spread: 160 HP / 252 SpA / 96 Spe
*Alternative Spread: 208 HP / 252 SpA / 48 Spe
Modest Nature
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe (if using Hidden Power Fighting)

224 Speed EVs let Roselia hit 221 Speed total (with Hidden Power Fighting and a corresponding Speed IV of 30), allowing Roselia to put Grumpig and Misdreavus that creep Pawniard to sleep, as well as hit Pawniard with Hidden Power Fighting before it strikes Roselia with Knock Off.
96 Speed Evs are enough to outspeed neutral nature 252 Spe base 45s, like Marowak, Golem, and Armaldo (189) by 1 point at 190 Speed total. However, less Speed can be ran; the minimum that should be ran is 44, so that it can still outspeed uninvested Solrock before being hit by Zen Headbutt. 48 EVs in Speed are ran rather than 44 in order to achieve an odd number of HP overall.
Special Attack is maximized here via a Modest nature and 252 SpA EVs, with the remainder of its EVs being placed in HP for added mixed bulk.

Defensive Roselia

Roselia @ Eviolite
Ability: Natural Cure
EVs: 248 HP / 36 Def / 224 SpD
*Alternative spread: 248 HP / 80 Def / 180 SpD
*Alternative spread: EVs: 248 HP / 252 SpD / 8 Def
*Alternative spread: EVs: 248 HP / 156 Def / 104 SpD
Calm Nature
IVs: 0 Atk

Roselia's EV spreads are listed from most effective to least effective here, and each accomplishes different things.
Roselia's first spread allows it to survive a +2 Ice Beam from Modest Gorebyss, and check it with Giga Drain after SR damage effectively:

+2 252+ SpA Gorebyss Ice Beam vs. 248 HP / 224+ SpD Eviolite Roselia: 224-264 (73.9 - 87.1%) -- guaranteed 2HKO after Stealth Rock
0 SpA Roselia Giga Drain vs. 0 HP / 4 SpD Gorebyss: 204-242 (81.2 - 96.4%) -- 56.3% chance to OHKO after Stealth Rock

Roselia's second spread provides it with enough Special Defense to survive the 2HKO from LO Simipour's Ice Beam, maximizes HP without yielding an even number, and then dumps the remainder of its EVs into Defense:

252 SpA Life Orb Simipour Ice Beam vs. 248 HP / 180+ SpD Eviolite Roselia: 127-151 (41.9 - 49.8%) -- guaranteed 3HKO

Additionally, the 80 EVs in Defense prevent threats like Jolly CB Basculin from OHKOing Roselia with Zen Headbutt, even with damage from Stealth Rock factored in:

252 Atk Choice Band Basculin Zen Headbutt vs. 248 HP / 80 Def Eviolite Roselia: 224-264 (73.9 - 87.1%) -- guaranteed 2HKO after Stealth Rock

vs

(Same calculation, but without 80 Def):
252 Atk Choice Band Basculin Zen Headbutt vs. 248 HP / 0 Def Eviolite Roselia: 258-304 (85.1 - 100.3%) -- 81.3% chance to OHKO after Stealth Rock

A minimum of 248 HP / 100 Def EVs on Roselia always allows Roselia to survive a +2 LO boosted Knock Off from Jolly 252 Atk Leafeon. However, this is not nearly as relevant a calculation, given Leafeon would be running an Adamant nature on team archetypes based around Sunny Day.

So, if Roselia has to survive a +2 LO boosted Knock off from Adamant Leafeon, it can run 248 HP / 156 Def EVs. However, in order to survive this hit, Roselia needs to have no prior damage:

Jolly +2 LO calc without Def:
+2 252 Atk Life Orb Leafeon Knock Off (97.5 BP) vs. 248 HP / 0 Def Eviolite Roselia: 305-360 (100.6 - 118.8%) -- guaranteed OHKO
Jolly +2 LO calc with 100 Def:
+2 252 Atk Life Orb Leafeon Knock Off (97.5 BP) vs. 248 HP / 100 Def Eviolite Roselia: 256-302 (84.4 - 99.6%) -- guaranteed 2HKO
Adamant +2 LO calc with 156 Def:
+2 252+ Atk Life Orb Leafeon Knock Off (97.5 BP) vs. 248 HP / 156 Def Eviolite Roselia: 256-302 (84.4 - 99.6%) -- guaranteed 2HKO

If this Roselia does not have Rapid Spin support with it, entry hazards and other forms of passive damage can take away Roselia's ability to take a +2 LO Knock Off from Leafeon, which means a straight 248 hp / 8 Def / 252 SpD EV spread with a Calm nature is also a possible spread if you don't have hazard removal.

Defensive Roselia with Speed

Roselia @ Eviolite
Ability: Natural Cure
EVs: 248 HP / 164 SpD / 96 Spe
Calm Nature
IVs: 0 Atk

This Roselia forgoes some Special Defense and Defense in favor of speed. 96 speed allows Roselia to outspeed neutral-natured 252 Spe base 45s like Golem by +1 and either attack or set hazards before they can make a move.
248 HP EVs are used instead of 252 in order to minimize damage from Stealth Rock, Burn damage (until it switches out), Sand Storm, and Hail.
Standard Machoke

Machoke @ Eviolite
Ability: Guts
EVs: 160 HP / 252 Atk / 52 Def / 44 SpD
*Alternative Spread: EVs: 160 HP / 252 Atk / 24 Def / 24 SpD / 48 Spe
Adamant Nature

Machoke can be used at various Speeds to hit slow, Fighting weak targets. For example, 92 Spe Machoke (149 Spe) outspeeds 128 Spe Modest Probopass (148) by 1 point, while just 48 Spe (138) is enough to outspeed Modest 84 Spe Probopass (137) and outspeed all other neutral-natured, uninvested base 50s (Audino, Regice, Lickilicky, Klang - 136).
Machoke should maximize Attack first, hit its desired Speed second, and split up its remaining EVs to optimize its bulk without giving Machoke an even number of HP third. The first spread maximizes bulk, while the second aims to outspeed relevant targets slower than 138 Speed, such as 84 Spe Probopass and Audino.

No Guard Dynamic Punch vs Probopass:
252+ Atk Machoke Dynamic Punch vs. 172 HP / 0 Def Probopass: 436-516 (143.4 - 169.7%) -- guaranteed OHKO
Healthy Machoke Close Combat vs Probopass:
252+ Atk Machoke Close Combat vs. 172 HP / 0 Def Probopass: 520-616 (171 - 202.6%) -- guaranteed OHKO
Guts activated Close Combat vs Probopass:
252+ Atk Guts Machoke Close Combat vs. 172 HP / 0 Def Probopass: 780-924 (256.5 - 303.9%) -- guaranteed OHKO

No Guard Dynamic Punch vs Lickilicky:
252+ Atk Machoke Dynamic Punch vs. 248 HP / 8 Def Lickilicky: 308-366 (72.8 - 86.5%) -- guaranteed 2HKO after Leftovers recovery
Healthy Machoke Close Combat vs Lickilicky:
252+ Atk Machoke Close Combat vs. 248 HP / 8 Def Lickilicky: 372-440 (87.9 - 104%) -- 25% chance to OHKO
Guts activated Close Combat vs Lickilicky:
252+ Atk Guts Machoke Close Combat vs. 248 HP / 8 Def Lickilicky: 558-656 (131.9 - 155%) -- guaranteed OHKO

As you can see, Guts sets with Close Combat are better options for taking down Lickilicky and Audino before losing its Eviolite, but Dynamic Punch No Guard sets are of course still viable.
Scrappy Stoutland

Stoutland @ Choice Band / Choice Scarf / Silk Scarf
Ability: Scrappy
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature / Jolly Nature

An Adamant nature, 252 Atk EVs, and a Choice Band are all used to improve Stoutland's wall breaking capabilities. After its Attack has been fully maximized, 252 Speed EVs should be used to speed tie with Adamant 252 Spe Arbok (259), while outspeeding Jolly 252 Spe Fraxure (256) and everything slower.
The same EVs are ran for Choice Scarf Stoutland. Using a Choice Scarf with an Adamant nature lets it reach 388 Speed (426 if Jolly nature), which lets Stoutland beat offensive teams more easily. 388 Speed is enough to revenge +1 Jolly 252 Spe Fraxure (384), Timid 252 Spe Zebstrika (364), and everything slower. Jolly 252 Spe Scarf Stoutland, while very rare, can be used to surprise and OHKO Modest 252 Spe Scarf Chatot (420).
Its last item, Silk Scarf, can be used in order to bluff the Choice item and beat Pokemon like Probopass. Its Attack without a Choice Band is more than enough to OHKO Probopass via Superpower:

252+ Atk Stoutland Superpower vs. 172 HP / 0 Def Probopass: 372-440 (122.3 - 144.7%) -- guaranteed OHKO

Sand Rush Stoutland

Stoutland @ Life Orb
Ability: Sand Rush
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
IVs: 29 HP

In a Sandstorm, Adamant 252 Spe invested Stoutland with Sand Rush hits 518 Speed total, and outspeeds +2 Adamant 252 Spe Kingler (498), +1 Timid 252 Spe Simipour, Simisage, Simisear (496), +1 Modest 252 Spe Floatzel (493), +1 Jolly 252 Spe Dodrio (492), and everything below. Although Jolly outspeeds everything up to 568 Speed (it clears +2 neutral nature 252 Spe base 85s, Scarf Raichu and +2 Adamant 252 Spe Stoutland, Drifblim), Jolly nature Stoutland should not be used in Sand, as it detracts too much from its sweeping capabilities.
Its remaining 4 EVs are placed in either Defense or Special Defense, in order to yield an odd number of HP and minimize passive damage like Leech Seed, Burn and Stealth Rock.
Standard Pawniard

Pawniard @ Eviolite
Ability: Defiant
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature / Jolly Nature

Adamant 252 Spe Pawniard hits 219 Speed total, and outspeeds notable targets such as Jolly 252 Spe Golem (207 Spe), uninvested Misdreavus (206), 252 Spe Modest Regice (199), uninvested Grumpig (196), and everything slower.
Pawniard, if running a Jolly nature, hits 240 Spe total and becomes able to outpace Pokemon that commonly creep Adamant Pawniard, such as offensive Roselia, Grumpig, and Misdreavus.
Pawniard should maximize its Attack, and place its remaining 4 EVs in Defense.
Specially Defensive Grumpig

Grumpig @ Leftovers
Ability: Thick Fat
EVs: 248 HP / 24 Def / 220 SpD / 16 Spe
*Alternative Spread: 248 HP / 8 Def / 252 SpD
*Alternative Spread: 248 HP / 244 SpD / 16 Spe
Calm Nature
IVs: 0 Atk

Calm Grumpig with maximum investment in Special Defense and HP is used to wall premier special threats in PU, such as Ninetales (lacking LO and Dark Pulse), Rotom-F, Psychics lacking Signal Beam and Shadow Ball, and many others via Thick Fat and its nice special bulk.
Placing 248 EVs in HP yields an odd number of HP overall, and therefore minimizes passive forms of damage. Its remaining 8 EVs can be placed in SpA, Def or Spe, based on the user's preference. Running 16 Speed total with a spread of 248 HP / 244 SpD / 16 Speed can be used to Taunt, Thunder Wave or Focus Blast neutral nature 252 Spe base 50s, like Regice and Beartic before they can make a move.
Finally, 24 EVs in Defense allow Grumpig to avoid being 3HKOed by Life Orb Rapidash's Flare Blitz, with Protect and Leftovers being factored in:

252 Atk Life Orb Rapidash Flare Blitz vs. 248 HP / 24 Def Thick Fat Grumpig: 146-173 (40.2 - 47.6%) -- guaranteed 3HKO after Leftovers recovery

Offensive Pivot Grumpig

Grumpig @ Colbur Berry / Leftovers
Ability: Thick Fat
EVs: 80 HP / 252 SpA / 176 Spe
Modest Nature / Timid Nature
IVs: 0 Atk

Modest 176 Speed invested Grumpig hits 240 Speed total, which is enough to outspeed Adamant 252 Spe Mightyena by 1 point. However, Grumpig can also run a Timid nature, which allows it to hit 264 Speed and outspeed standard Adamant Stoutland (259), Adamant Arbok (259), and Adamant Monferno (261).
After this, its Special Attack is maximized, and then its remaining EVs are placed in HP for the added bulk (without producing an even number of HP overall).
Colbur Berry halves the damage of Supereffective Dark type moves and is therefore useful in letting Grumpig OHKO Mightyena with its Focus Blast, but Leftovers lets Grumpig continually check threats with its Thick Fat and high Special Defense.

252+ Atk Life Orb Mightyena Crunch / Sucker Punch vs. 80 HP / 0 Def Colbur Berry Grumpig: 207-243 (64.4 - 75.7%) -- guaranteed 2HKO

252+ SpA Grumpig Focus Blast vs. 0 HP / 4 SpD Mightyena: 336-396 (119.5 - 140.9%) -- guaranteed OHKO

Max Speed Grumpig

Grumpig @ Leftovers / Colbur Berry
Ability: Thick Fat
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk

With a Timid Nature and 252 EVs placed in Speed, Grumpig hits 284 Speed and Speed ties with Jolly 252 Spe Arbok and Stoutland (284). More notably, it outspeeds +2 neutral nature 0 Spe Klang (272), Modest 252 Spe Articuno (268 with HP Fighting or 269 without), Jolly 252 Spe Solrock (262), Adamant 252 Spe Monferno (261), Adamant 252 Spe Stoutland and Arbok (259), and everything below.
In tandem with a Colbur Berry, this allows Grumpig to easily revenge threats like Arbok with Psychic, even if it has used Sucker Punch after several Coil Boosts:

+3 252+ Atk Arbok Sucker Punch vs. 0 HP / 4 Def Colbur Berry Grumpig: 253-298 (84 - 99%) -- guaranteed 2HKO

In return:

252 SpA Grumpig Psychic vs. 0 HP / 4 SpD Arbok: 278-330 (106.5 - 126.4%) -- guaranteed OHKO

Additionally, while Focus Blast doesn't OHKO Stoutland, it is easily able to revenge Stoutland after some initial damage. Simultaneously, Stoutland is very unlikely to switch out of a Focus Blast, given most Grumpig run max SpDef or just enough Speed for Mightyena:

252 SpA Grumpig Focus Blast vs. 0 HP / 4 SpD Stoutland: 222-262 (71.3 - 84.2%) -- guaranteed 2HKO

Finally, Leftovers is an option as the item of choice, because Timid Substitute / Calm Mind is also a viable option here.

Tank Grumpig

Grumpig @ Leftovers / Colbur Berry
Ability: Thick Fat
EVs: 240 HP / 252 SpA / 16 Spe
Modest Nature
IVs: 0 Atk

Grumpig can forgo its Speed in order to maximize its bulk, so that it can take on specially based threats such as RP Regice and Rotom-F more efficiently without sacrificing any Special Attack in order to do so.
240 HP yields an odd number of HP overall, while 16 Speed lets Grumpig outspeed Modest 252 Spe Regice before a Rock Polish.
Stealth Rock Lead Golem

Golem @ Custap Berry / Weakness Policy
Ability: Sturdy
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant / Jolly Nature

252 EVs in Attack with an Adamant Nature and Weakness Policy is preferred to maximize damage against faster targets with Sucker Punch, or slower targets with Rock Blast or Earthquake.
Jolly nature or a Custap Berry can also be ran to prevent Golem from losing speed ties against other 252 Spe neutral nature base 45s like Marowak, Wigglytuff and Armaldo. Similarly, Jolly nature allows Golem to outspeed Pokemon like Politoed who aim to outspeed these base neutral-natured base 45s by a point, and can strike first with a +2 Stone Edge or EQ after Golem has activated its WP.
The remaining 4 EVs should be placed in Special Defense in order to allow Golem to sometimes survive a Surf from 112 SpA Mold Breaker Rampardos:

112 SpA Mold Breaker Rampardos Surf vs. 4 HP / 0 SpD Golem: 304-360 (100.6 - 119.2%) -- guaranteed OHKO
112 SpA Mold Breaker Rampardos Surf vs. 0 HP / 4 SpD Golem: 300-356 (99.6 - 118.2%) -- 93.8% chance to OHKO

Specially Defensive Golem

Golem @ Leftovers
Ability: Sturdy
EVs: 248 HP / 16 Def / 240 SpD / 4 Spe
*Alternative Spread: 248 HP / 8 Def / 252 SpD (with a Careful Nature)
*Alternative Spread: 248 HP / 32 Atk / 228 SpD (with a Careful Nature)
*Alternative Spread: 248 HP / 56 Atk / 204 SpD (with an Adamant Nature)
Impish Nature

Specially Defensive Golem can be ran one of 4 ways: the first spread uses an Impish nature for improved physical bulk, 16 Def EVs for a jump point in Defense, maximum HP without yielding an even number of HP overall, and 4 EVs in Speed to creep uninvested, neutral-natured base 45s, with the remainder of its EVs being placed in Special Defense.
Its Careful spread simply maximizes Special Defense and HP, letting it survive longer against threats such as standard Zebstrika.
Its second Careful spread allows Golem to OHKO Pawniard with 32 Atk EVs, while investing the rest of its EVs in HP and Special Defense.
And finally, its Adamant spread accomplishes the same thing, while yielding a jump point in Attack.

Tank Golem

Golem @ Leftovers
Ability: Sturdy
EVs: 128 HP / 252 Atk / 128 Spe
Adamant Nature

128 Spe Golem hits 158 Spe total, which is enough to creep uninvested Vullaby (156 Spe - use two more points in Speed out of HP in order to creep 8 Spe Vullaby).
Once its desired Speed has been reached, Golem should maximize its Attack, while placing the remainder of its EVs in HP.
All-Out Attacker Monferno

Monferno @ Eviolite / Life Orb
Ability: Iron Fist
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature / Jolly Nature

Monferno utilizes an offensive spread with a combination of maximum Attack, Iron Fist, U-turn and Mach Punch to clean and pivot on a number of threats in PU. At the same time, it uses its superior defensive typing in combination with an Eviolite in order to beat prominent physical threats like Pawniard.
Monferno is at a unique Speed Tier (base 81), which allows it to outspeed base 80s such as Stoutland without needing to run a Jolly nature.
However, if it uses a Jolly nature, it reaches 287 Speed total, which allows it to pivot on or OHKO Timid 172 Spe Grumpig (262), positive-natured 252 Spe invested base 80s such as Stoutland, Glalie, Arbok, Grumpig, Altaria (284), +2 neutral-natured 0 Spe Klang (272), and neutral-natured 252 Spe base 85s such as Golduck and Articuno (269).
Its last 4 EVs are placed in Defense, in order to avoid giving Monferno an even number of HP.

Stallbreaker Monferno

Monferno @ Eviolite
Ability: Blaze / Iron Fist
EVs: 248 HP / 8 Def / 252 SpD
*Alternative Spread: 248 HP / 8 Atk / 252 Def (if using Impish)
Careful Nature / Impish Nature

Stallbreaker Monferno is easily able to counter many physical attackers in PU (especially attackers like Mightyena who are also at a type disadvantage) with its great defensive typing. Due to its access to Will-O-Wisp, Taunt, and Slack Off, it can easily come in on Mightyena, Sawsbuck, Leafeon, Gogoat, Beartic, to name a few.
Monferno should always maximize its HP and defenses, while placing the remaining 8 EVs in its other defensive stat. Giving it an odd number of HP will also reduce the damage it takes from passive sources, like Hail and Sandstorm, Leech Seed, Poison, etc.
Alternatively, Monferno can run full Special Defense to beat threats dependent on their Ice-type STAB attacks, like Rotom-F's Blizzard.

Suicide Lead Monferno

Monferno @ Focus Sash
Ability: Blaze
EVs: 252 SpA / 252 Spe
*Alternative Spread: 252 SpA / 4 SpD / 252 Spe (if Endeavor is not used)
Timid Nature

Lead Timid 252 Spe Monferno hits 287 Speed total, which is enough to outspeed and Taunt every lead in the PU meta, except for +1 Jolly 252 Spe Venipede (351), Naive 252 Spe Leavanny (311), and the rarely seen Jolly 252 Spe Gabite (289).
Its remaining EVs are used to maximize Overheat's damage. Its final 4 EVs are not used because this extra bulk is more or less useless and detracts slightly from Monferno's ability to use Endeavor with as little HP as possible. However, if Endeavor is not being used, then these last 4 EVs should be placed in Special Defense.
If Endeavor is being used in conjunction with Mach Punch, then Monferno should use a Naive Nature with 4 EVs placed in Attack rather than Special Defense.
Standard Stunfisk

Stunfisk @ Leftovers
Ability: Static
EVs: 248 HP / 252 Def / 8 Spe
*Alternative Spread: 248 HP / 252 SpD / 8 Spe (if using Calm)
Bold Nature / Calm Nature
IVs: 0 Atk

Stunfisk's main goal should be to maximize either Defense or Special Defense with a Bold or Calm nature, respectively.
Then, it should run 248 EVs in HP in order to both optimize its walling capabilities and yield an odd number of HP overall.
Its final 8 EVs can be placed in the other defensive stat, or in Speed in order to outspeed Hippopotas by 2 points rather than forcing the speed-tie and subsequently being hit by its STAB Earthquake.
Standard Zebstrika

Zebstrika @ Life Orb
Ability: Sap Sipper / Lightning Rod
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk / 30 Def

Timid Zebstrika outruns the majority of the unboosted meta in PU with its Speed stat of 364, such as positive nature 252 spe invested base 115s (i.e. Floatzel, Persian at 361 Speed), Timid 252 Spe Swoobat (359), Jolly 252 Spe Purugly (355), and everything below.
252 EVs in Special Attack are used to make Zebstrika a viable revenge killer, with the last 4 EVs in Def rather than in HP to reduce passive damage taken via an odd number of HP.
The given IVs yield a 60 BP Hidden Power Ice, while simultaneously minimizing Life Orb recoil via an HP stat ending in 9, and its Attack, so that Zebstrika takes less damage from confusion and Foul Play.
Standard Jumpluff

Jumpluff
Ability: Infiltrator / Chlorophyll
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

Jolly 252 Spe Jumpluff hits 350 Speed total and Speed ties with Timid 252 Spe Raichu, while outspeeding +1 Jolly 252 Spe Ursaring (343), positive nature 252 Spe base 105s (i.e. Rapidash, Electabuzz and Kadabra at 339 Speed), and everything below.
After its Speed has been maximized, 252 EVs should be placed in its Attack stat, as it needs all the power it can get to be threatening to the opponent.
Its final 4 EVs are placed in one of Jumpluff's defenses in order to give Jumpluff an odd number of HP, which is best used when attempting to switch into Stealth Rock.

Utility Jumpluff

Jumpluff
Ability: Infiltrator / Chlorophyll
EVs: 248 HP / 8 SpD / 252 Spe
Jolly Nature

Rather than increasing its offensive capabilities via maximum Attack investment and Swords Dance, Utility Jumpluff should invest 248 EVs in its HP stat to maximize its survivability so that it can use its support moves when it has to. 248 HP EVs yield an odd number of HP overall, which is important for allowing Jumpluff to switch into Stealth Rock one more time.
Utility Jumpluff's Speed is also maximized via 252 EV investment and a Jolly nature, so that Jumpluff can successfully use Memento or Sleep Powder before it faints.
Its last 8 EVs should be placed in Special Defense in order to improve its usable base 95 Special Defense stat.
Wishpasser Audino

Audino @ Leftovers
Ability: Regenerator
EVs: 248 HP / 252 SpD / 8 Spe
Careful Nature

Audino with 8 Spe outspeeds all other neutral-natured uninvested base 50s (136 Spe) at 138 Spe total, and hits an odd number of HP with 248 HP.
The rest of its EVs should be allocated toward its Special Defense in order to allow Audino to take as many hits on the special end of the spectrum as possible.

Tank Audino

Audino @ Life Orb
Ability: Regenerator
EVs: 248 HP / 252 Atk / 8 Spe
Adamant Nature

Audino is able to forgo Leftovers and max Special Defense in favor for a physically offensive Tank set, being able to heavily damage Pokemon, which normally set up on Audino, as well as lure Rock- and Steel-types that normally switch into it with Drain Punch.
248 HP already yields an HP stat ending in 9, which is ideal for minimizing the amount of recoil that is incurred by Life Orb.
The remainder of its EVs should be allocated toward its Attack stat, with its final 8 EVs being placed in Speed to outpace other neutral-natured, uninvested base 50s (i.e. Klang, Regice, Lickilicky, and other Audino).

A Rank

SubSD Bouffalant

Bouffalant @ Leftovers
Ability: Sap Sipper / Soundproof
EVs: 248 HP / 136 Atk / 124 Spe
*Alternative Spread: 136 HP / 248 Atk / 124 Spe
Adamant Nature

Adamant 124 Spe Bouffalant allows it to outspeed base 70s, such as Solrock and Politoed before being hit by Scald or Will-O-Wisp.
Once its desired Speed is reached, it should maximize either its Attack or HP for added bulk, with the rest of its EVs being used for Attack or HP, depending on whether more bulk or more Attack is desired.
248 HP makes it so Solrock cannot break Bouffalant's Substitute, while Swords Dance and maximum Attack both make better use of its offensive prowess.
SubSD can be ran with more Special Defense at the cost of Attack in order to avoid its Substitute being broken by attacks like uninvested Roselia's Sludge Bomb.

AV Bouffalant

Bouffalant @ Assault Vest
Ability: Sap Sipper
EVs: 248 HP / 252 Atk / 8 SpD
*Alternative Spread: 168 HP / 252 Atk / 88 Spe
Adamant Nature

252 Attack EVs and an Adamant nature lets Bouffalant OHKO Jumpluff and Floatzel after SR damage has been factored in.
This set and spread should maximize HP as well in order to make the most of its Assault Vest with its remaining 8 Spe being allocated toward its Special Defense.
Alternatively, 88 Spe EVs can be taken from HP in order to outspeed neutral-natured base 65s, such as Roselia.
124 Spe can also be used to outspeed base 70s, but investing this much in Speed limits Bouffalant's bulk, which goes counter to the point of running Assault Vest.

CB Bouffalant

Bouffalant @ Choice Band
Ability: Reckless
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature / Jolly Nature

Adamant 252 Spe Bouffalant hits 209 Spe, which outspeeds all positive-natured base 45s (e.g. Golem, Armaldo, etc.), and everything slower.
Running Jolly has the benefit of hitting 229 Speed total, outspeeding relevant threats such as Adamant Pawniard, Grumpig creeping Pawniard, and Adamant 252 Spe Relicanth.
After its desired Speed has been reached, its Attack should be maximized.
Its remaining 4 EVs should be placed in Defense or Special Defense to yield an odd number of HP, so as to minimize passive damage from various sources such as Burn, Leech Seed, Sandstorm, etc.
Special Attacker Kadabra

Kadabra @ Focus Sash / Life Orb
Ability: Magic Guard
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe (if Hidden Power Fighting)

Maximum investment in Speed should be ran as this allows Kadabra to speed tie with other base positive nature 252 Spe invested 105s like Electabuzz and Rapidash, while outspeeding all base 101 Pokemon and below, such as Simipour, Simisage, Simisear, Ninetales, Dodrio, Sawsbuck, Leafeon, etc.
Focus Sash and Magic Guard are used in conjunction with maximum Special Attack investment as a stop to powered up sweepers that can't afford to take a hit from Kadabra.
Kadabra runs its last 4 EVs in HP despite this yielding an even number of HP, due to the fact that Magic Guard prevents all forms of passive damage on Kadabra, and so running an odd number of HP is no longer necessary in this case.

Running Life Orb is also a viable option to make switching into Kadabra even more difficult. For example, offensive variants of Grumpig, Metang, and Mr. Mime are all 2HKOed or OHKOed by LO Shadow Ball. Additionally, LO Psychic lets Kadabra OHKO Simisear, Simipour, and Simisage after SR damage:

Simisear, Simisage, and Simipour:
252 SpA Life Orb Kadabra Psychic vs. 0 HP / 4 SpD Simisear: 263-309 (90.3 - 106.1%) -- guaranteed OHKO after Stealth Rock
252 SpA Life Orb Kadabra Psychic vs. 4 HP / 0 SpD Simipour: 265-312 (90.7 - 106.8%) -- guaranteed OHKO after Stealth Rock
252 SpA Life Orb Kadabra Psychic vs. 0 HP / 0- SpD Simisage: 294-347 (101 - 119.2%) -- guaranteed OHKO

Offensive Grumpig:
252 SpA Life Orb Kadabra Shadow Ball vs. 80 HP / 0 SpD Grumpig: 198-234 (61.6 - 72.8%) -- guaranteed 2HKO after Leftovers recovery

Mr. Mime (Filter Survives 2HKO from LO Kadabra's Shadow Ball after SR):
252 SpA Life Orb Kadabra Shadow Ball vs. 0 HP / 4 SpD Mr. Mime: 185-218 (83.7 - 98.6%) -- 68.8% chance to OHKO after Stealth Rock
252 SpA Life Orb Kadabra Shadow Ball vs. 0 HP / 4 SpD Filter Mr. Mime: 138-164 (62.4 - 74.2%) -- guaranteed 2HKO after Stealth Rock

Max HP Offensive Metang:
252 SpA Life Orb Kadabra Shadow Ball vs. 248 HP / 0 SpD Eviolite Metang: 174-205 (53.8 - 63.4%) -- guaranteed 2HKO

Magic Guard also lets Kadabra gain the benefits of Life Orb without incurring any recoil damage as a result.
Standard Dodrio

Dodrio @ Choice Band / Choice Scarf / Life Orb / Sharp Beak
Ability: Early Bird
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
IVs: 29 HP (if LO)

Jolly 252 Spe invested Dodrio hits 328 Speed, which outspeeds Jolly 252 Spe Gourgeist-Small (326), positive nature 252 Spe base 98s (i.e. Basculin, Swanna at 324 Speed), Timid 252 Spe Frogadier (322), +1 Jolly 252 Spe Whirlipede (318), all positive nature 252 Spe base 95s (317), and everything below.
If using a Choice Scarf to turn Dodrio into a revenge killer, Dodrio hits 492 Speed, which outspeeds everything up to +1 Jolly 252 Spe Sawsbuck (475).
Given Choice Scarf Dodrio clears this 475 Speed benchmark by quite a bit, more EVs could be taken out of Speed and placed into HP. However, it should still keep its Speed stat maximized in case it ever needs to win a Speed tie with itself, or if its Choice Scarf is removed via Knock Off, Switcheroo, or Trick.
Its remaining EVs are used to maximize its Attack stat, and to produce an odd number of HP overall in order to reduce damage taken from Stealth Rock.
Rock Polish Regice

Regice @ Life Orb
Ability: Clear Body
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 29 HP / 0 Atk

After a Rock Polish, Modest 252 Spe invested Regice hits 398 Speed total, and outspeeds +1 Jolly 252 Spe Fraxure (384), Timid 252 Spe Zebstrika (364), positive nature 252 Spe base 115s (i.e. Floatzel, Persian at 361 Speed), and everything below.
While there is a large gap in Speed from Regice to Fraxure that means Regice could run some HP EVs, 252 Spe EVs are still ran to Speed tie with +2 Adamant 252 Spe Beartic and other Rock Polish Regice.
Modest Nature, 252 SpA EVs and a Life Orb are used to improve Regice's cleaning capabilities, while the last 4 EVs are placed into Defense or Special Defense in order to avoid an even number of HP.
Giving Regice an HP stat ending in 9 is also optimal (299 total with a HP IV of 29), because the best way to reduce this residual damage is an HP stat that is one under a stat divisible by 10, meaning the last digit would be 9.
Regice should also use an Attack IV of 0 to limit the amount of damage taken by both Foul Play and confusion.

Special Tank Regice

Regice @ Leftovers
Ability: Clear Body
EVs: 248 HP / 8 Def / 252 SpA
*Alternative Spread: 220 HP / 252 SpA / 36 Spe
Modest Nature
IVs: 0 Atk

Regice is also capable of running a Special Tank set because of its great bulk. With this set, it should still maximize its Special Attack with Modest and 252 EV investment. However, this Tank set trades the Speed it would normally run with Rock Polish for increased mix bulk.
It is important for this Regice to run an odd number of HP, in order to reduce the damage it takes from Stealth Rock every time it switches in.
The Speed Regice can run is variable; it can either place its remaining 8 EVs in Defense, or it can choose to run enough Speed to outspeed uninvested Gourgeist-Super (144) by 2 points and other uninvested base 50s (i.e. Carbink, Klang, Lickilicky at 136 Speed).
Defensive Vullaby

Vullaby @ Eviolite
Ability: Overcoat
EVs: 248 HP / 252 Def / 8 SpD with a Bold nature
*Alternative Spread: 248 HP / 8 Def / 252 SpD with a Calm nature
Bold Nature / Calm Nature

248 EVs in HP gives Vullaby an odd number of HP, allowing it to switch into Stealth Rock five times instead of four.
Maximum investment in Defense with a Bold nature allows Vullaby to handle threats such as Jumpluff, Stoutland, Sawsbuck, Purugly, Dodrio, etc.
Overcoat Vullaby is especially great for countering Jumpluff, given it's immune to Jumpluff's Sleep Powder, and it can take a +2 252 Atk Acrobatics from Jumpluff with ease:

Jumpluff vs Vullaby:
252 Atk Jumpluff Acrobatics (110 BP) vs. 248 HP / 252+ Def Eviolite Vullaby: 61-73 (17.7 - 21.2%) -- possible 5HKO
+2
252 Atk Jumpluff Acrobatics (110 BP) vs. 248 HP / 252+ Def Eviolite Vullaby: 121-144 (35.2 - 41.9%) -- guaranteed 3HKO
After Vullaby has used Roost:
+2 252 Atk Jumpluff Seed Bomb vs. 248 HP / 252+ Def Eviolite Vullaby: 88-105 (25.6 - 30.6%) -- guaranteed 4HKO

Vullaby vs Jumpluff:
0- Atk Vullaby Foul Play vs. 0 HP / 0 Def Jumpluff: 121-144 (41.5 - 49.4%) -- guaranteed 3HKO
+2
0- Atk Vullaby Foul Play vs. 0 HP / 0 Def Jumpluff: 243-286 (83.5 - 98.2%) -- guaranteed 2HKO

A specially defensive spread with a Calm nature can also be used to capitalize on Vullaby's respectable Special Defense stat and allow it to check Psychic- and Ghost-types more effectively, such as Kadabra.
Although it isn't mandatory, Vullaby can run 44 EVs in Speed to outspeed uninvested Pelipper and Taunt it before it can use Defog, Roost, or Toxic.
Choice Scarf Chatot

Chatot @ Choice Scarf
Ability: Tangled Feet
EVs: 252 SpA / 4 SpD / 252 Spe
*Alternative Spread: 252 SpA / 56 SpD / 200 Spe
Timid Nature / Modest Nature
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe

Chatot should first have its Special Attack maximized so that it can do as much damage as possible.
Investing 252 EVs in Speed with a Timid nature allows Chatot to reach 463 Speed total, which lets it Boomburst on Jolly Ninjask (460), Heat Wave on Scarf Timid 252 Spe Soundproof Mr. Mime (or Boomburst on Filter variants - 459), and Timid Scarf Rotom-f (447).

If Chatot only needs to outspeed Adamant 252 Spe Ninjask (419), then Chatot can run a Modest nature with 252 Speed EVs and a Choice Scarf to reach 420 Speed total.

Alternatively, Chatot can invest slightly in Special Defense to increase its odds at cleaning when faced with Kadabra.
56 Special Defense EVs let Chatot survive a Psychic from Kadabra at full health, which means that if it hasn't taken any prior damage, Chatot can sweep past Focus Sash Kadabra:

252 SpA Kadabra Psychic vs. 0 HP / 56 SpD Chatot: 246-289 (83.9 - 98.6%) -- guaranteed 2HKO

The remaining Speed (200 Speed EVs without a Choice Scarf) lets Chatot hit 268 Speed, which is enough to outspeed Adamant 252 Spe Monferno (261 Speed), max Speed neutral nature base 80s at 259 Speed (i.e. Stoutland, Arbok), and everything slower.
With a Choice Scarf, this Modest 200 Spe spread reaches 402 Speed, which is enough to outspeed Rain Beartic and Rock Polish Regice by 4 points.

Choice Specs Chatot

Chatot @ Choice Specs
Ability: Tangled Feet
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe

The given EV spread with a Timid nature is used to maximize Chatot's power and Speed. At 309 Speed, Chatot outspeeds Timid 252 Spe invested Mr. Mime (306), +2 Timid 252 Spe Torkoal (304), and everything below.
Chatot is especially effective on teams with Sticky Web support, as this allows Chatot to outspeed grounded Pokemon up to 463 Speed.
Choice Specs allows Chatot some potential as a wallbreaker, as a Specs boosted Boomburst is able to 2HKO fully specially defensive Lickilicky after Stealth Rock.

252 SpA Choice Specs Chatot Boomburst vs. 252 HP / 252+ SpD Lickilicky: 202-238 (47.6 - 56.1%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

The last 4 EVs are placed in Defense instead of HP to reduce damage taken from Stealth Rock.
Rock Polish Relicanth

Relicanth @ Lum Berry / Leftovers / Stone Plate
Ability: Rock Head
EVs: 104 HP / 252 Atk / 4 Def / 148 Spe
Adamant Nature

Relicanth should maximize its offensive capabilities via full investment in Attack with an Adamant Nature.
A minimum of 148 EVs in Speed should be used to outspeed neutral nature base 70s and everything slower before using Rock Polish. For example, this includes relevant targets such as Solrock (176), Vibrava (176), and Roselia (166).
After a Rock Polish, 148 Speed EVs allow Relicanth to outspeed Timid 252 Spe Zebstrika by 2 points at 366 Speed total.
The remainder of its EVs should be allocated toward its bulk, without yielding an even number of HP overall. 108 EVs in HP yields an even number, so 4 EVs are taken out and placed in its Defense stat in order to avoid extra damage from passive sources.

Defensive Relicanth

Relicanth @ Leftovers
Ability: Rock Head
EVs: 248 HP / 232 Def / 28 Spe
*Alternative Spread: 248 HP / 212 Def / 48 Spe
Impish Nature

Defensive Relicanth should hit its desired Speed first, maximize its HP second, and place the remainder of its EVs in Defense third.
28 Speed outspeeds Timid 252 Spe Torkoal by 1 point, while the second spread outspeeds Vullaby (156), Tangela (156), and Volbeat (157). Doing so allows Relicanth to outspeed and OHKO Volbeat, and 2HKO Vullaby. While you won't do any damage to Tangela, this also allows you to set up Stealth Rock or Toxic on Tangela before Relicanth faints.

0 Atk Relicanth Head Smash vs. 248 HP / 252+ Def Eviolite Vullaby: 170-204 (49.5 - 59.4%) -- 99.6% chance to 2HKO

0 Atk Relicanth Head Smash vs. 252 HP / 252+ Def Volbeat: 306-360 (91.6 - 107.7%) -- 43.8% chance to OHKO

Rain Lead Relicanth

Relicanth @ Damp Rock
Ability: Sturdy
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature

In order to ensure that Relicanth can set up Rain Dance or Stealth Rock on the maximum number of targets before being KOed or Taunted, Relicanth should utilize a Jolly nature in conjunction with full investment in its Speed stat. This allows Relicanth to Speed tie max nature 252 Spe base 55s and neutral nature 252 Spe base 65s (e.g. Flareon, Ursaring before Toxic Orb at 229 Speed), and outspeed everything slower.
Its Attack stat should also be maximized so that its Head Smash can hit as hard as possible.

Offensive Tank Relicanth

Relicanth @ Stone Plate / Leftovers
Ability: Rock Head
EVs: 168 HP / 252 Atk / 88 Spe
Adamant Nature

Offensive Tank Relicanth with 88 Spe and an Adamant nature hits 168 Speed total, and outspeeds Roselia by 2 points. Doing so allows Relicanth to OHKO Roselia, assuming it's carrying a Stone Plate or Hard Stone to boost its damage output with Head Smash.
After its Attack has been fully maximized, Tank Relicanth should place the remainder of its EVs in HP for added bulk. 168 HP is used to yield an odd number of HP overall, which is superior for slightly reducing the amount of damage incurred from passive sources.
Choice Scarf Mr. Mime

Mr. Mime @ Choice Scarf
Ability: Filter / Soundproof
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk

Timid 252 Spe invested Mr. Mime with a Choice Scarf hits 459 Speed total, and outspeeds +1 Timid 252 Spe Rotom-Frost (447), +2 Jolly 252 Spe Huntail (446), and everything below.
The rest of its EVs are placed in Special Attack, in order to optimize its capabilities as a revenge killer.
The final 4 EVs are placed in Special Defense to improve its already great Special Defense stat, as well as give it an odd number of HP in order to minimize passive damage taken.

Life Orb Mr. Mime

Mr. Mime @ Life Orb
Ability: Filter / Soundproof
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk

Timid 252 Spe invested Mr. Mime hits 306 Speed, and outspeeds Timid 252 Spe Rotom-F (298) and everything below.
With a Life Orb and 252 EVs in Special Attack, Mr. Mime has a guaranteed 2HKO on Lickilicky with its Focus Blast. Technician HP Fighting can be ran instead for guaranteed hits, however it is only a 3HKO, even with Stealth Rock factored in:

252 SpA Life Orb Technician Mr. Mime Hidden Power Fighting vs. 248 HP / 252+ SpD Lickilicky: 161-190 (38 - 44.9%) -- guaranteed 3HKO after Stealth Rock and Leftovers recovery

252 SpA Life Orb Mr. Mime Focus Blast vs. 248 HP / 252+ SpD Lickilicky: 213-252 (50.3 - 59.5%) -- 82.4% chance to 2HKO after Leftovers recovery

Giving Mr. Mime an HP stat ending in 9 is also optimal (219 total with a HP IV of 29), because the best way to reduce this residual damage is an HP stat that is one under a stat divisible by 10, meaning the last digit would be 9.

Choice Specs Mr. Mime

Mr. Mime @ Choice Specs
Ability: Filter / Soundproof
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk

Specs Mime can be used over LO for its ability to 2HKO common specially defensive switch-ins, such as Grumpig:

252+ SpA Choice Specs Mr. Mime Dazzling Gleam vs. 252 HP / 0 SpD Grumpig: 166-196 (45.6 - 53.8%) -- 94.1% chance to 2HKO after Stealth Rock and Leftovers recovery

Specs Mime runs a Modest nature, as it doesn't need Timid in order to outspeed the Pokemon below it, such as Articuno and Golduck (as these options run Modest as well).'t doesnt really need timid as things below it (articuno/golduck) will run modest as well.
Like the other EV spreads for Mr. Mime, Specs Modest should maximize Special Attack and Speed, while placing its remaining 4 EVs in one of its defenses in order to avoid an even number of HP overall.
SubSalac Simipour

Simipour @ Salac Berry
Ability: Torrent
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk

Using 4 HP EVs gives Simipour an even number of HP, which allows it to activate its Salac Berry after 3 Substitutes. While its Salac Berry can be activated after two Substitutes with Gluttony, Torrent is the preferred ability here for its ability to maximize Simipour's damage output with Hydro Pump and Nasty Plot.
Timid with maximum Speed investment (331) beats everything up to positive nature 252 Spe base 100s and lower (e.g. Ninetales, Dodrio) when unboosted, and everything slower than 496 Speed after its Salac Berry has been activated (e.g. Scarf Modest Floatzel (493), Scarf Jolly Dodrio (492), Scarf Sawsbuck (475), etc.).

All-out Attacker Simipour

Simipour @ Life Orb
Ability: Torrent
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
IVs: 29 HP

Max Speed is still essential here for outspeeding positive nature 252 Spe base 100s like Dodrio and Ninetales. 4 Atk with a Naive nature is only necessary when running Low Kick to beat Lickilicky and Regice, or Knock Off to beat Roselia switch-ins. This set usually spams special moves though, so full SpA investment is crucial here.
Unlike SubSalac Simipour, an odd number of HP is ran to minimize passive forms of damage like Stealth Rock.
An optional HP IV of 29 is given here to optimally reduce Life Orb recoil.

AoA/NP Torrent Special Simipour

Simipour @ Life Orb
Ability: Torrent
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk

Simipour can run NP + 3 Attacks, or 4 special attacks in conjunction with Life Orb and Torrent to hit as hard as possible.
An HP IV of 29 optimally reduces Life Orb recoil, while 0 Atk minimizes the damage from Foul Play and confusion.
Like the other sets, Speed is maximized first to take advantage of its Speed tier, Special Attack is fully invested in, and its remaining 4 EVs are placed in one of its defensive stats.
 
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A- Rank

Standard Sweeper Leafeon

Leafeon @ Occa Berry / Yache Berry / Life Orb
Ability: Chlorophyll
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
IVs: 29 HP (if Life Orb)

Jolly 252 Spe invested Leafeon hits 317 Speed, which is enough to outspeed Naive 252 Spe Leavanny (311), and everything below.
Its remaining EVs are used to maximize its Attack, with the final 4 EVs being placed in Defense to avoid yielding an even number of HP.
An HP IV of 29 is optional here to optimally reduce Life Orb recoil, while Fire and Ice resist berries help Leafeon stay alive when combating threats such as LO Zebstrika.

CB Leafeon (made by me :o)

Leafeon @ Choice Band
Ability: Leaf Guard
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

Leafeon's Choice Band set uses Bullet Seed with maximum Attack to beat leads like Golem, Relicanth, and Rampardos through Sturdy and Focus Sash with just a 2 hit (however, keep in mind Leafeon must use Leaf Guard instead as its ability, given Chlorophyll with Bullet Seed is an illegal combination):

Golem:
252+ Atk Choice Band Leafeon Bullet Seed (2 hits) vs. 0 HP / 0 Def Golem: 392-464 (130.2 - 154.1%) -- guaranteed OHKO

Lead Rampardos:
252+ Atk Choice Band Leafeon Bullet Seed (2 hits) vs. 0 HP / 0 Def Rampardos: 364-432 (108.6 - 128.9%) -- guaranteed OHKO

Rain Lead Relicanth:
252+ Atk Choice Band Leafeon Bullet Seed (2 hits) vs. 0 HP / 4 Def Relicanth: 392-464 (114.9 - 136%) -- guaranteed OHKO

Leaf Blade is used to wallbreak, and scores some notable OHKOes / 2HKOes:

Physically defensive Stunfisk:
252+ Atk Choice Band Leafeon Leaf Blade vs. 248 HP / 252+ Def Stunfisk: 348-410 (82.6 - 97.3%) -- 25% chance to OHKO after Stealth Rock

Physically defensive Misdreavus:
252+ Atk Choice Band Leafeon Knock Off (97.5 BP) vs. 252 HP / 240 Def Eviolite Misdreavus: 226-268 (69.7 - 82.7%) -- guaranteed 2HKO

Physically defensive Relicanth:
252+ Atk Choice Band Leafeon Leaf Blade vs. 248 HP / 252+ Def Relicanth: 516-612 (128 - 151.8%) -- guaranteed OHKO
252+ Atk Choice Band Leafeon Bullet Seed (3 hits) vs. 248 HP / 252+ Def Relicanth: 432-516 (107.1 - 128%) -- guaranteed OHKO

Lickilicky:
252+ Atk Choice Band Leafeon Leaf Blade vs. 252 HP / 0 Def Lickilicky: 225-265 (53 - 62.5%) -- guaranteed 2HKO after Leftovers recovery

CM Clefairy:
252+ Atk Choice Band Leafeon Leaf Blade vs. 252 HP / 252+ Def Eviolite Clefairy: 159-187 (46.2 - 54.3%) -- 54.3% chance to 2HKO

After its Attack has been maximized, it full invests in Speed (289 Spe total) in order to outspeed Jolly Monferno (287), with the remainder of its EVs placed in Defense or Special Defense to avoid an even number of HP.

Sun Sweeper Leafeon

Leafeon @ Life Orb / Meadow Plate
Ability: Chlorophyll
EVs: 112 HP / 248 Atk / 148 Spe
Adamant Nature

Adamant 148 Spe invested Leafeon hits 263 out of Sun, and outspeeds Jolly 252 Spe Solrock (262), neutral nature 252 Spe base 80s (e.g. Drifblim, Stoutland, etc. at 259 Speed), and everything below.
After Chlorophyll has activated, Leafeon's Speed doubles and hits 526 Speed total, which is enough to outspeed +1 Timid 252 Spe Raichu by 1 point.
The given HP EVs give Leafeon an HP stat ending in 9, which optimally reduces Life Orb recoil. In order to achieve this HP stat, 4 EVs were taken out of Attack instead of Speed, so as to keep Leafeon at 526 Speed in the Sun. However, if running Meadow Plate, giving Leafeon an HP stat ending in '9' is unnecessary.

As an alternative, Leafeon can run a slower spread for increased bulk, while still outspeeding important targets in the Sun.

Leafeon @ Life Orb / Meadow Plate
Ability: Chlorophyll
EVs: 192 HP / 252 Atk / 64 Spe
*Alternative Spread: 200 HP / 252 Atk / 56 Spe if Meadow Plate
Adamant Nature

Normally, a spread of 200 HP / 252 Atk / 56 Spe would be used, but in order to optimally reduce Life Orb recoil, its HP stat is reduced to a stat total ending in 9 (i.e. using 319 HP here instead of 321 HP).
Using 56 Speed allows Leafeon to hit 240 Spe outside of Sun, and 480 Spe while its Chlorophyll is active. This means that Leafeon is still able to outspeed +1 Jolly 252 Spe Sap Sipper Sawsbuck (475), and everything below.
The only Pokemon that 56-64 Spe Leafeon misses outspeeding in the Sun with this alternative spread are +1 Timid 252 Spe Simipour (496), +2 Adamant 252 Spe Kingler (498), +2 Adamant 252 Spe Drifblim and Stoutland (518), and +1 Timid 252 Spe Raichu (525).

Defensive Pivot Leafeon

Leafeon @ Leftovers
Ability: Chlorophyll
EVs: 252 HP / 212 Def / 44 Spe
Impish Nature

44 Speed outspeeds positive nature 252 Spe invested base 58s, like Zweilous and Rampardos, while better handling physical sweepers like RP Relicanth.
Mixed Attacker Simisage

Simisage @ Life Orb
Ability: Overgrow
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
IVs: 29 HP

Naive 252 Spe invested Simisage hits 331 Speed total, and outspeeds positive nature 252 Spe base 100s (i.e. Dodrio, Ninetales at 328 Speed), Jolly / Timid 252 Spe Gourgeist-Small (326), positive nature 252 Spe base 98s (i.e. Basculin, Swanna at 324 Speed), and everything below.
252 EVs are placed into Attack to allow Life Orb Simisage to hit as hard as possible.
Either a Naive or Jolly nature is used here, based on Simisage's set. If using Seed Bomb over Leaf Storm, then a Jolly nature is used. However, if Simisage is using Leaf Storm, then a Naive nature with the last 4 EVs in SpA is used to prevent Leaf Storm's damage from being lowered. Leaf Storm is however, the superior choice because of its ability to wallbreak Stunfisk (the reasoning is found here: http://www.smogon.com/forums/threads/pu-teambuilding-shop.3528733/page-5).
A Naive nature is also used over Hasty when Leaf Storm is used, so that Simisage takes less damage from priority like Sucker Punch or Mach Punch.
And lastly, Simisage can run an HP IV of 29 in order to reduce Life Orb recoil.

Nasty Plot Simisage

Simisage @ Life Orb
Ability: Overgrow
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk / 30 Def

As stated above, Timid 252 Spe invested Simisage hits 331 Speed and outspeeds positive nature 252 Spe base 100s, and everything below.
Rather than using any Attack EVs, this set attempts to sweep with Nasty Plot and 3 special attacks, so 252 SpA EVs with a Timid nature are used.
If using a Hidden Power, its IVs will be slightly changed to fit the Hidden Power of your choosing (Rock, Ice or Fire here). The given IVs produce a Hidden Power Ice, while simultaneously minimizing its Attack stat and therefore, damage from confusion and Foul Play.
Its last 4 EVs are placed in Def in order to produce an odd number of HP.

Choice Scarf Simisage

Simisage @ Choice Scarf
Ability: Overgrow
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature

Like the other Simisage sets above, this one also runs maximum Attack and Speed. However, this Simisage is played differently, as its Choice Scarf allows it to outspeed +1 Jolly 252 Spe Dodrio, +1 Jolly 252 Spe Sawsbuck, and everything below with its Speed stat of 496.
Substitute Salac Berry sets also hit this same Speed, so that is an option if you want Simisage to be fast, but not be locked into one move.
Standard Raichu

Raichu @ Life Orb / Choice Scarf / Expert Belt
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk / 30 Def (if Life Orb with Hidden Power Ice)

Life Orb Raichu runs a standard offensive spread to outspeed +1 Jolly nature 252 Spe invested Ursaring (343), positive nature 252 Spe base 105s (e.g. Rapidash, Kadabra, Electabuzz at 339 Speed), and everything below.
A Choice Scarf lets Raichu hit 525 Speed total and outspeed Adamant 252 Spe Stoutland in Sand (518), Adamant 252 Spe Drifblim after an Unburden boost (518), and everything below.
4 EVs in SpD rather than HP give Raichu an odd number of HP, thereby reducing passive forms of damage, such as Stealth Rock, Weather, and the like.
If using a Life Orb with Nasty Plot (Raichu's best set), then Raichu should drop its HP stat to a number ending in 9, so that it can minimize Life Orb recoil. Additionally, the given IVs yield a 60 BP Hidden Power Ice, while simultaneously minimizing Raichu's Attack stat so that it reduces damage from confusion and Foul Play as well.
Moxie Cleaner Mightyena

Mightyena @ Life Orb
Ability: Moxie
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
IVs: 29 HP

Adamant 252 Spe invested Mightyena hits 239 Speed total and speed-ties other neutral nature 252 Spe base 70s (i.e. Lunatone, Luxray), while outspeeding everything below (e.g. positive nature 252 Spe base 58s, like Rampardos at 236 Speed).
A Jolly nature should not be ran, as this detracts from the amount of damage which Mightyena can inflict with its Life Orb (and possibly Moxie) boosted Sucker Punch.
Its remaining 4 EVs are placed into Defense in order to yield an odd number of HP overall, which reduces forms of passive damage done to Mightyena (e.g. Stealth Rock, Burn, Poison, Leech Seed, etc.)
Lastly, Mightyena runs an HP IV of 29 in order to reduce Life Orb recoil.
Offensive Pivot Probopass

Probopass @ Air Balloon
Ability: Magnet Pull
EVs: 172 HP / 252 SpA / 84 Spe
*Alternative Spread: 248 HP / 248 SpA / 12 Spe
*Alternative Spread: 128 HP / 252 SpA / 128 Spe
Modest Nature

Offensive Probopass should run 84 Speed (137 total) in order to outspeed uninvested Klang (136 total). Probopass can run as little as 12 Speed for uninvested Probopass and Beheeyem (116) and Adamant uninvested Slow Start Regigigas (118), but can run as fast as 128 Speed in order to successfully Volt Switch on uninvested Relicanth.
After investing 84 EVs in Speed and maximizing Special Attack, its remaining EVs should be placed in HP for longevity. 172 EVs in HP keeps Probopass' HP stat at an odd number, which is ideal for reducing passive forms of damage like Burn, Leech Seed and Hail.

SpDef Probopass

Probopass @ Leftovers
Ability: Sturdy
EVs: 248 HP / 248 SpD / 12 Spe
Calm Nature

This Probopass forgoes its Special Attack and Speed in favor of increased bulk. 12 Spe allows Probopass to outspeed Adamant uninvested Regigigas (affected by Slow Start) by 1 point with 119 Speed total. This prevents Probopass from being hit by Drain Punch before it's able to either finish Regigigas off or use Stealth Rock.
248 HP yields an odd number of HP overall, which is better for reducing passive sources of damage.
Sturdy and Leftovers is generally the superior choice for this set, given the Steel types that it traps beat SpDef Probopass anyway. Additionally, running an Air Balloon is not imperative either because this Probopass does not 2HKO Piloswine with Flash Cannon like its Offensive Pivot counterpart does.
Standard Electrode

Electrode @ Life Orb
Ability: Soundproof
EVs: 252 SpA / 4 Def / 252 Spe
Modest Nature
IVs: 0 Atk

Electrode reaches 379 Speed and outspeeds the majority of PU's unboosted metagame (save Ninjask).
With a Modest nature, Life Orb, and full EV investment in its Special Attack, Electrode is able to hit harder than LO Zebstrika.
Its remaining EVs should be placed in one of its defenses, while its Attack should minimized in order to help Electrode take damage from Foul Play and confusion better.
However, if Explosion is being used, Electrode can utilize a Naive or Hasty Nature with 4 EVs in Attack instead of Defense.
Offensive Coil Arbok

Arbok @ Black Sludge
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
*Alternative Spread: 236 HP / 252 Atk / 20 Spe
Adamant Nature

While Adamant Arbok running 252 Spe is a good idea to outspeed everything at 258 Speed and below (e.g. Jolly 252 Spe Fraxure, Jolly 252 Spe Kricketune, Adamant 252 Spe Kingler, etc.), Arbok can also run slightly slower speeds for enhanced bulk.
The absolute slowest speed Arbok should hit is 201 Speed (faster than uninvested Gabite by 1 point). Coincidentally, reaching 201 Speed requires that Arbok run 236 EVs in HP, which yields a Leftovers (Black Sludge) number, too, so a spread of 236 HP / 252 Atk / 20 Spe with an Adamant Nature and Black Sludge is perfectly viable.
Another possible speed to hit is 240, which outspeeds neutral nature 252 Spe base 70s (i.e. Lunatone, Mightyena, and Luxray) by 1 point.
After the Speed Arbok needs to hit has been chosen and Attack has been fully maximized via 252 EV investment and an Adamant nature (this is far superior to a Jolly nature because Adamant and 252 Atk EVs maximize Sucker Punch's damage against faster targets), the remainder of its EVs is allocated toward its HP stat.
If running an even number of HP, try to make the number it hits overall divisible by 16. This will ensure that Arbok gains one more HP from Black Sludge every turn.

Specially Defensive Coil Arbok

Arbok @ Black Sludge
Ability: Shed Skin
EVs: 236 HP / 252 SpD / 20 Spe
Careful Nature

Firstly, Arbok invests 20 EVs into Speed in order to hit 201 Speed total. With a Careful nature, 20 Spe outspeeds Adamant uninvested Gabite (200) by 1 point, so that Arbok can hit with a boosted Gunk Shot or Aqua Tail before it's KO'd by Gabite's Earthquake, if necessary. Similarly, this Speed also outspeeds specially Defensive Grumpig, which is also useful for hitting it with a boosted Gunk Shot before it fires off a powerful STAB Psychic.
Secondly, Arbok uses 236 HP to obtain a Leftovers number here (320 is divisible by 16), because passive damage other than entry hazards, Leech Seed, Hail and Sandstorm does not bother Arbok due to Rest and Shed Skin restoring or reversing whatever has happened to Arbok. Coil, Rest, Black Sludge, and Shed Skin all maximize Arbok's staying power.
Finally, the remainder of its EVs are used together with a Careful nature to maximize its Special Defense, as its Defense is already being boosted via Coil.
Offensive Cryogonal

Cryogonal @ Life Orb / Leftovers
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe (with Timid)
*Alternative Spread: 4 Atk / 252 SpA / 252 Spe (with Hasty)
Timid Nature / Hasty Nature
IVs: 29 HP (if Life Orb)

Positive-natured 252 Spe invested Cryogonal hits 339 Speed total, and speed-ties with other base 105s (Rapidash, Electabuzz, and Kadabra without Hidden Power Fighting), as well as outspeeding positive-natured 252 Spe base 101s such as Simisage (331).
Cryogonal should first optimize the damage it does with its Ice-type moves by placing 252 EVs in Spe, and then maximizing its Speed.
If Cryogonal is using Knock Off or Explosion, then it should use a Hasty nature with 4 EVs in Atk. Otherwise, it should use a Timid nature with its remaining 4 EVs in Special Defense.
An HP IV of 29 lets it hit a Life Orb number, which reduces the recoil it takes from LO.

Another possible spread is to drop the speed to 332 in order to outpace Simisage and Simipour, while placing 16 EVs in Defense in order to avoid the OHKO from Golduck's 252+ LO-boosted Psyshock:

252+ SpA Life Orb Golduck Psyshock vs. 0 HP / 16 Def Cryogonal: 237-279 (84.3 - 99.2%) -- guaranteed 2HKO

Defensive Cryogonal

Cryogonal @ Leftovers
Ability: Levitate
EVs: 248 HP / 156 Def / 104 SpD
*Alternative Spread: 248 HP / 156 Def / 88 SpD / 16 Spe
Calm Nature
IVs: 0 Atk

The following spread maximizes Cryogonal's HP and Special Defense, while yielding an odd number of HP overall in order to allow it to switch into Stealth Rock one more time, so that it can remove entry hazards with Rapid Spin more reliably.
156 Def EVs allow it to survive a Mach Punch from Adamant 252 Atk Iron Fist Monferno after Stealth Rock damage has been incurred:

252+ Atk Iron Fist Monferno Mach Punch vs. 248 HP / 156 Def Cryogonal: 216-254 (62.9 - 74%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

This spread also allows Cryogonal to live a Sucker Punch from Pawniard, while uninvested Hidden Power Fighting OHKOes:

252+ Atk Pawniard Sucker Punch vs. 248 HP / 156 Def Cryogonal: 187-222 (54.5 - 64.7%) -- guaranteed 2HKO after Leftovers recovery

0 SpA Cryogonal Hidden Power Fighting vs. 0 HP / 4 SpD Eviolite Pawniard: 224-268 (96.9 - 116%) -- 87.5% chance to OHKO
28 SpA
Cryogonal Hidden Power Fighting vs. 0 HP / 4 SpD Eviolite Pawniard: 232-276 (100.4 - 119.4%) -- guaranteed OHKO
(OHKOes Pawniard with Hidden Power Fighting and no previous damage with just 28 SpA EVs)

Finally, an Attack IV of 0 minimizes damage taken from confusion and Foul Play.
Its alternative spread with 16 EVs taken from Special Defense and placed in Speed make it less bulky, however these EVs allow Cryogonal to outspeed Naughty / Adamant 252 Spe Kingler (249 Spe) by +1 in order to strike first with Freeze-Dry on Kingler's low Special Defense stat.
Dragon Dance Fraxure

Fraxure @ Eviolite
Ability: Mold Breaker
EVs: 252 Atk / 4 Def / 252 Spe
*Alternative Spread: 48 HP / 252 Atk / 208 Spe
Jolly Nature

Before a Dragon Dance, Jolly 252 Spe invested Fraxure hits 256 Speed total, which outspeeds Jolly 252 Spe Kricketune (251), Adamant 252 Spe Kingler (249), and everything below.
After a Dragon Dance, +1 Fraxure with the same EVs hits 384 Speed total, which outspeeds Timid 252 Spe Zebstrika (364), positive nature 252 Spe base 115s (i.e. Persian, Floatzel at 361 Speed), and everything below.

Given outspeeding Zebstrika by 20 Speed after one Dragon Dance isn't necessary, Fraxure can run just enough Speed to outpace Zebstrika by 2 points after a boost, and reallocate some of the EVs from Speed into HP. An alternative spread of 48 HP / 252 Atk / 208 Spe with a Jolly nature lets Fraxure hit 244 Speed total, while outspeeding all of the same targets after a single Dragon Dance and improving its mixed bulk. The only notable Pokemon that 244 (208 Speed Jolly Fraxure) Speed fails to outpace before a Dragon Dance are other Jolly 252 Spe Fraxure, and Adamant 252 Spe Kingler.

An Adamant nature is not recommended here, as it only hits 348 Speed after a Dragon Dance (233 before) and fails to outspeed many important PU threats (e.g. Raichu, Jumpluff, Zebstrika, Swoobat, Floatzel, etc.), although an Adamant Dragon Dance set with Sticky Web or paralysis support could work.

The last 4 EVs are placed in Defense in order to yield an odd number of HP overall, so that passive forms of damage are minimized. 48 EVs in HP also achieves the same result.

Choiced Fraxure

Fraxure @ Choice Band / Choice Scarf
Ability: Mold Breaker
EVs: 252 Atk / 4 Def / 252 Spe
Adamant / Jolly Nature

Depending on your team's needs, Fraxure can start with either the Speed or the Attack of Dragon Dance Fraxure without taking the turn needed to setup. Adamant with a Choice Band is used for Wallbreaking, whereas Jolly 252 Spe with a Choice Scarf can outspeed the majority of the unboosted meta.

Leading with Jolly 252 Spe CB Fraxure can be done to stop Kricketune's Sticky Web 100% of the time (so long as Dual Chop does not miss with its 90% accuracy), as shown by the following calculation:

252 Atk Choice Band Mold Breaker Fraxure Dual Chop (2 hits) vs. 0 HP / 4 Def Kricketune: 308-366 (104.4 - 124%) -- guaranteed OHKO

This is only relevant when facing low ladder, however. The real reason to run Dual Chop is to combat Focus Sash Kadabra, which can open the way for your other sweepers.

The following calculations show that Adamant 252 Atk CB Fraxure 2HKO's or OHKO's almost every notable wall (some need Stealth Rock to manage this), meaning that nothing except for immunities are able to switch into Fraxure's Outrage / Low Kick:

Adamant CB Fraxure's wallbreaking capabilities:
252+ Atk Choice Band Mold Breaker Fraxure Outrage vs. 248 HP / 244 Def Eviolite Misdreavus: 219-258 (67.8 - 79.8%) -- guaranteed 2HKO

252+ Atk Choice Band Mold Breaker Fraxure Outrage vs. 248 HP / 80 Def Eviolite Roselia: 322-381 (106.2 - 125.7%) -- guaranteed OHKO

252+ Atk Choice Band Mold Breaker Fraxure Outrage vs. 248 HP / 252+ Def Eviolite Vullaby: 174-205 (50.7 - 59.7%) -- guaranteed 2HKO

252+ Atk Choice Band Mold Breaker Fraxure Outrage vs. 248 HP / 0 Def Eviolite Tangela: 178-210 (53.4 - 63%) -- guaranteed 2HKO
252+ Atk Choice Band Mold Breaker Fraxure Outrage vs. 248 HP / 8+ Def Eviolite Tangela: 160-190 (48 - 57%) -- 90.6% chance to 2HKO

252+ Atk Choice Band Mold Breaker Fraxure Outrage vs. 248 HP / 252+ Def Gourgeist-Super: 187-222 (50.1 - 59.5%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

252+ Atk Choice Band Mold Breaker Fraxure Low Kick (100 BP) vs. 252 HP / 0 Def Lickilicky: 350-412 (82.5 - 97.1%) -- 62.5% chance to OHKO after Stealth Rock

252+ Atk Choice Band Mold Breaker Fraxure Low Kick (120 BP) vs. 248 HP / 8 Def Avalugg: 234-276 (59.5 - 70.2%) -- guaranteed 2HKO after Leftovers recovery
Offensive Tangela

Tangela @ Eviolite
Ability: Regenerator
EVs: 248 HP / 252 SpA / 8 Spe
*Alternative Spread: 208 HP / 252 SpA / 48 Spe
Modest Nature
- Hidden Power [Ice] --> Use 8 more Speed for Fire

Tangela should maximize Special Attack first, hit its desired Speed second, and place the remaining EVs into HP without giving Tangela an even number of HP third.
Modest 8 Spe Tangela hits 158 Speed, which outspeeds Relaxed 0 Speed IV Volbeat by 1 point and uninvested Vullaby by 2 points.
Alternatively, Tangela can also run 48 Spe EVs to hit 168 Speed total, so that it can Knock Off an uninvested Roselia's Eviolite before fainting to Sludge Bomb.

Defensive Tangela

Tangela @ Eviolite
Ability: Regenerator
EVs: 248 HP / 252 Def / 8 Spe
*Alternative Spread: 248 HP / 212 Def / 48 Spe
Bold Nature

Defensive Tangela is used to wall premier physical threats like Moxie Mightyena, CB Stoutland, Golem, etc.
In the same way its offensive counterpart is given EVs, defensive Tangela should maximize its HP first, hit its desired Speed second, and dump the rest into its Defense stat third.
8 Spe outspeeds uninvested Vullaby (156) and other uninvested Tangela (156), along with slow U-Turn Volbeat (157).
As stated above, 48 Spe outspeeds uninvested Roselia.
Quick Feet Ursaring

Ursaring @ Toxic Orb
Ability: Quick Feet
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

With a Jolly nature, 252 Spe EVs and Quick Feet activated, Ursaring hits 343 Speed total and outspeeds all positive nature 252 Spe invested base 105s (i.e. Kadabra, Cryogonal, Rapidash, and Electabuzz), and everything below.
Running Adamant is an option for more power, however it is probably not worth the loss in Speed, because Adamant Quick Feet Ursaring is outsped by positive nature 252 Spe base 105s, Simipour/Sage/Sear, Dodrio, Ninetales, Basculin, Swanna, Sawsbuck and Leafeon.

Guts Ursaring

Ursaring @ Flame Orb / Toxic Orb
Ability: Guts
EVs: 4 HP / 252 Atk / 252 Spe
Brave Nature / Adamant Nature / Jolly Nature
*IVs: 0 Spe (only if using a Brave Nature)

Though greatly inferior to Quick Feet Ursaring, Guts is still usable to maximize its Attack. Adamant 252 Atk Ursaring with Guts and a Flame Orb turns Ursaring into a slower wallbreaker that can open many holes in even the most defensive of teams. For example, using an Adamant nature allows you to do ~70% to defensive Misdreavus, and gives you a small chance to OHKO Avalugg after Stealth Rock (very effective if Avalugg has any prior damage).

252+ Atk Guts Ursaring Crunch vs. 252 HP / 240 Def Eviolite Misdreavus: 210-248 (64.8 - 76.5%) -- guaranteed 2HKO

252+ Atk Guts Ursaring Close Combat vs. 248 HP / 8 Def Avalugg: 250-296 (63.6 - 75.3%) -- 6.3% chance to OHKO after Stealth Rock

While an Adamant nature with 252 Spe lets you outspeed any walls you may be trying to break at 209 speed total, Jolly is still an option to speed tie neutral nature 252 Spe invested base 65s and outspeed everything below. By using Jolly, Ursaring is able to outspeed Jolly 252 Spe Huntail, neutral nature 252 Spe base 58s (Rampardos, Zweilous), and Jolly 252 Spe Whirlipede.

The choice of Orb is dependent on how long you plan to stay in with Ursaring. Toxic Orb is slashed over Flame Orb because three turns of residual poison damage is less than three turns of burn damage; however, if Toxic Orb is used, it's best not to keep Ursaring in longer than three turns if you plan to send it in later.

Finally, a Brave Nature with a Speed IV of 0 is listed as an option if you're using Ursaring on a Trick Room team.
Standard Rapidash

Rapidash @ Charcoal / Life Orb / Leftovers
Ability: Flash Fire
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

Maximum investment in Speed should be ran as this allows Rapidash to speed-tie with other base positive nature 252 Spe invested 105s like Electabuzz, Cryogonal, and Kadabra, while outspeeding all base 101 Pokemon and below, such as Simipour, Simisage, Simisear, Ninetales, Dodrio, Sawsbuck, Leafeon, etc.
Charcoal or Life Orb with 252 EVs in Attack allow Rapidash to hit as hard as possible. Its last 4 EVs should be placed in Defense, in order to avoid giving Rapidash an even number of HP that would otherwise increase damage taken from switching into Stealth Rock.
If Rapidash is running Life Orb for the extra power, it should use an HP IV of 29 in order to reduce Life Orb recoil.
B+ Rank

Offensive Metang with Rocks

Metang @ Eviolite
Ability: Clear Body
EVs: 248 HP / 252 Atk / 8 Spe
Adamant Nature

8 Spe Metang hits 138 Speed total, which is enough to outspeed 84 Spe Probopass (137), while yielding an odd number of HP overall.
After this Speed stat of 138 has been reached, 252 EVs in conjunction with an Adamant nature are used to fully maximize its Attack stat, which allows it to sometimes OHKO Probopass with Earthquake:

252+ Atk Metang Earthquake vs. 160 HP / 0 Def Probopass: 244-288 (81 - 95.6%) -- 12.5% chance to OHKO after Stealth Rock

Metang's remaining 248 EVs are placed in HP for some extra bulk, which yields an odd number of HP overall.

Specially Defensive Metang

Metang @ Eviolite
Ability: Clear Body
EVs: 248 HP / 252 SpD / 8 Spe
Careful Nature

Metang has other alternatives, such as running max Special Defense to beat Psychics running Shadow Ball, Chatot, and other specially based threats. For example, Careful max Spdef and max HP lives the 2HKO from LO Kadabra's Shadow Ball:

252 SpA Life Orb Kadabra Shadow Ball vs. 248 HP / 252+ SpD Eviolite Metang: 120-143 (37.1 - 44.2%) -- guaranteed 3HKO

Physically Defensive Metang

Metang @ Eviolite
Ability: Clear Body
EVs: 248 HP / 124 Atk / 136 Def
Impish Nature

Metang with 136 Def and Impish lets Metang avoid the 3HKO from CB Floatzel and CB Stoutland (avoids the 2HKO from Stoutland's Crunch before SR as well), while still doing a nice chunk of damage to Psychics with Pursuit.

252 Atk Choice Band Floatzel Waterfall vs. 248 HP / 136+ Def Eviolite Metang: 90-106 (27.8 - 32.8%) -- guaranteed 4HKO

252+ Atk Choice Band Stoutland Pursuit vs. 248 HP / 136+ Def Eviolite Metang: 68-82 (21 - 25.3%) -- 0.1% chance to 4HKO
252+ Atk Choice Band Stoutland Crunch
vs. 248 HP / 136+ Def Eviolite Metang: 136-162 (42.1 - 50.1%) -- 0.4% chance to 2HKO
Special Attacker Altaria

Altaria @ Life Orb
Ability: Natural Cure / Cloud Nine
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature / Timid Nature
IVs: 29 HP

252 SpA EVs and a Modest nature let Altaria OHKO offensive Arbok. 252 Spe EVs with a Modest nature reach 259 Speed total, and speed-ties with other neutral-natured 252 Spe invested base 80s (i.e. Glalie, Stoutland, Drifblim, Arbok, and Grumpig).
If using a Timid nature, Altaria can outspeed these neutral-natured base 80s, as well as +2 uninvested Impish Klang (272), 252 Spe Modest Articuno and Golduck (269), and 252 Spe Adamant Monferno (261).
Timid with Cloud Nine is a potent combination, as this lets Altaria Draco Meteor on Rain Dance Golduck (in rain), rather than being OHKOed by its LO-boosted Ice Beam. It also allows Altaria to Draco Meteor on Sand Rush Stoutland in a Sandstorm before being hit by Return or Facade.
Its remaining 4 EVs should be placed in Special Defense or Defense, so as to allow Altaria to switch into Stealth Rock one more time.
An HP IV of 29 reduces recoil from Life Orb.

Offensive Dragon Dance Altaria

Altaria @ Yache Berry / Leftovers
Ability: Natural Cure
EVs: 64 HP / 252 Atk / 192 Spe
Adamant Nature

192 Speed EVs lets Altaria reach 244 Spe before a Dragon Dance, and 366 Spe after a Dragon Dance, which outspeeds Zebstrika (364) and other Pokemon that commonly creep Zebstrika (Modest 196 Spe Electrode - 365 Spe).
After this Speed has been reached, its Attack should be fully maximized to do as much damage with its Dragon-type STABs as possible after setting up.
The remainder of its EVs should be placed in HP for added mixed bulk, while yielding an odd number of HP at the same time. This allows it to switch into Stealth Rock one more time.

Bulky Dragon Dance Altaria

Altaria @ Leftovers
Ability: Natural Cure
EVs: 248 HP / 68 SpD / 192 Spe
Careful Nature

192 Speed EVs let Careful Altaria hit 244 Spe before a Dragon Dance, and 366 Spe after a Dragon Dance, which outspeeds Zebstrika (364) and other Pokemon that may creep Zebstrika by 1 pt (196 Spe Electrode - 365 Spe).
Next, its HP is maximized while yielding an odd number for switching into Stealth Rock an additional time, while the remaining 68 EVs should be placed into Special Defense, in order to increase its odds against specially based threats such as Ninetales and Kadabra.

Physically Defensive Altaria

Altaria @ Leftovers
Ability: Natural Cure
EVs: 248 HP / 164 Def / 96 Spe
Bold Nature
IVs: 0 Atk

96 Spe with a Bold nature lets Altaria hit 220 Speed and outspeed Adamant 252 Spe Pawniard (219) by +1.
Next, its HP is maximized, and the remaining EVs are placed in Defense.
Choice Band Ninjask

Ninjask @ Choice Band
Ability: Infiltrator
EVs: 252 Atk / 4 SpA / 252 Spe
Naughty Nature / Naive Nature

Maximum investment in Attack and Speed allows Ninjask to hit as hard and be as fast as possible. Adamant / Naughty 252 Spe Ninjask hits 419 Speed total, which outspeeds the entire unboosted PU metagame, including +2 neutral nature 252 Spe base 50s (i.e. Regice at 398 Speed), +1 Jolly 252 Spe Fraxure (384), Timid 252 Spe Zebstrika (364), and everything below.
A Naughty nature with 4 EVs in SpA lets Ninjask hit Defensive Relicanth and other defensive Rock type switch-ins as hard as possible with Giga Drain. Expert Belt is an option here, as a Naughty 4 SpA Giga Drain has the potential to 2HKO Golem after Stealth Rock (while healing off the damage from Sucker Punch):

Golem vs Ninjask:
252+ Atk Golem Sucker Punch vs. 0 HP / 0 Def Ninjask: 170-200 (64.6 - 76%) -- guaranteed 2HKO

Ninjask vs Golem:
4 SpA Ninjask Giga Drain vs. 0 HP / 4 SpD Golem: 180-212 (59.8 - 70.4%) -- guaranteed 2HKO
4 SpA Expert Belt Ninjask Giga Drain vs. 0 HP / 4 SpD Golem: 216-254 (71.7 - 84.3%) -- guaranteed 2HKO

Ninjask vs Relicanth
4 SpA Ninjask Giga Drain vs. 104 HP / 0 SpD Relicanth: 180-212 (49 - 57.7%) -- 95.3% chance to 2HKO
4 SpA Expert Belt Ninjask Giga Drain vs. 104 HP / 0 SpD Relicanth: 216-254 (58.8 - 69.2%) -- guaranteed 2HKO
4 SpA Ninjask Giga Drain vs. 248 HP / 0 SpD Relicanth: 180-212 (44.6 - 52.6%) -- 17.2% chance to 2HKO
4 SpA Expert Belt Ninjask Giga Drain vs. 248 HP / 0 SpD Relicanth: 216-254 (53.5 - 63%) -- guaranteed 2HKO

A Jolly nature / Naive nature can be used to allow Ninjask to outspeed +1 Timid 252 Spe Mr. Mime (459) by 1 point, just in case your team needs more Speed to counter certain boosted Pokemon.

The above EV spread yields an odd number of HP overall for Ninjask, which is absolutely crucial in letting it switch into Stealth Rock two times instead of one without fainting when hazard removal is not present or has already been KO'd.
Physically Defensive Misdreavus

Misdreavus @ Eviolite
Ability: Levitate
EVs: 248 HP / 244 Def / 16 Spe with Timid
*Alternative Spread: 248 HP / 228 Def / 32 Spe with Timid
*Alternative Spread: 248 HP / 228 Def / 32 Spe with Bold
Timid Nature / Bold Nature
IVs: 0 Atk
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe (if Hidden Power Fighting)

Timid Nature with 16 speed EVs (231 speed total) allows Misdreavus to outspeed neutral natured base 252 Spe invested 65s and lower (i.e. Flareon, Heatmor, Seviper, positive-natured 252 Spe Dwebble, and positive-natured 252 Spe Relicanth.).
However, 32 Speed with the same nature (235 total) lets Misdreavus outspeed and Taunt positive nature 252 Spe Quilladin (234) before it lays a layer of Spikes.
The last spread listed takes Misdreavus' bulk to the maximum with W-o-W, Pain Split and lowered speed (32 Speed with Bold is the slowest Misdreavus should be ran).
32 Speed with a Bold Nature allows it to outspeed Jolly 252 Spe Whirlipede by two points, as well as Adamant 252 Spe Quilladin before it uses Synthesis or Spikes.

Specially Defensive Misdreavus

Misdreavus @ Eviolite
Ability: Levitate
EVs: 248 HP / 228 SpD / 32 Spe
Calm Nature
IVs: 0 Atk

248 HP gives Misdreavus an odd number of HP and minimizes passive damage taken. 32 Spe is used to outspeed Adamant 252 Spe Quilladin and Jolly 252 Spe Whirlipede, along with other slower leads.
If running Hidden Power Fighting, be sure to run 4 more Speed EVs to compensate for the 30 Speed IV.
Its EV spread of 248 HP / 228 SpD with a Calm nature lets Misdreavus check special attackers such as Kadabra and Mr. Mime.

252 SpA Kadabra Shadow Ball vs. 248 HP / 228 SpD Eviolite Misdreavus: 100-118 (30.9 - 36.5%) -- 56.5% chance to 3HKO
252 SpA Mr. Mime Shadow Ball vs. 248 HP / 228 SpD Eviolite Misdreavus: 88-104 (27.2 - 32.1%) -- guaranteed 4HKO

0 SpA Misdreavus Shadow Ball vs. 4 HP / 0 SpD Kadabra: 204-240 (91.8 - 108.1%) -- 50% chance to OHKO
0 SpA Misdreavus Shadow Ball vs. 0 HP / 4 SpD Filter Mr. Mime: 96-114 (43.4 - 51.5%) -- 98.4% chance to 2HKO after Stealth Rock

Nasty Plot Misdreavus

Misdreavus @ Eviolite
Ability: Levitate
EVs: 24 HP / 252 SpA / 232 Spe
Modest Nature
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe (if Hidden Power Fighting)

Misdreavus should hit 263 Speed (264 with Thunderbolt over Hidden Power Fighting, which creates an imperfect Speed IV of 30), so that it can outspeed CB Scrappy Stoutland, AoA Monferno, and Taunt Onix and Solrock before they use Taunt, Stealth Rock, or Screens (in Solrock's case).
Then, Misdreavus should maximize its Special Attack stat via 252 EV investment and a Modest Nature.
24 EVs in HP yield an odd number of HP, which is ideal for reducing passive forms of damage.

Misdreavus @ Eviolite
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 1 Atk / 30 Def / 30 SpA / 30 SpD / 30 Spe (if Hidden Power Fighting)

This set seeks to maximize Taunt's usefulness, given Misdreavus at 295 Speed (or 294 if you choose HP Fighting again) prevents every Rock Setter, including Monferno and Gabite, from setting up Stealth Rock on your side of the field. Otherwise, it plays the same as Modest NP Misdreavus with just a little less Special Attack and bulk overall.
SubRoost Articuno

Articuno @ Leftovers
Ability: Pressure
EVs: 252 SpA / 4 SpD / 252 Spe with Timid
*Alternative Spread: EVs: 248 HP / 124 SpD / 136 Spe with Calm
Timid Nature / Calm Nature
IVs: 0 Atk

Substitute + Roost Articuno can run a few different EV spreads. One good alternative is to fully invest in its Speed, which allows it to setup Substitutes on the maximum number of Pokemon in the tier, while stalling them out with a combination of Substitute, Roost and its ability, Pressure.
Timid 252 Spe Articuno hits 295 Speed, which outspeeds Timid 252 Spe Servine (291), Jolly 252 Spe Gabite (289), positive-natured 252 Spe Monferno (287), and everything below.
After Articuno's Speed has been fully invested in, the rest of its EVs are used to maximize its Special Attack and therefore, the damage it does with its Ice-type STAB and Hurricane. Its final 4 EVs are placed in Special Defense, in order to avoid an even number of HP so that Articuno can switch into Stealth Rock one more time.

There are bulkier spreads that Articuno can run while using Toxic. In these cases, the desired Speed that Articuno should reach on different teams decides how much bulk it should use. For example, 136 Spe EVs with a Calm nature hits 240 Speed total, which outspeeds neutral-natured 252 Spe base 70s (i.e. Luxray, Lunatone, Mightyena) by 1 point. With this amount of Special Defense (248 HP / 124 SpD), 252 SpA Life Orb Raichu can never finish Articuno with a Volt Switch, even if it switches directly into Stealth Rock before being hit:

252 SpA Life Orb Raichu Volt Switch vs. 248 HP / 124+ SpD Articuno: 159-190 (41.5 - 49.6%) -- guaranteed 3HKO after Leftovers recovery

More or less Speed can be ran with HP maximized and the remainder in either Special Attack or Special Defense, but it is critical to always run an odd number of HP overall to let it switch into Stealth Rock one more time without being KO'd.

Agility Articuno

Articuno @ Life Orb
Ability: Pressure
EVs: 32 HP / 248 SpA / 228 Spe
Modest Nature
IVs: 1 Atk / 30 Def / 30 Spe / 30 SpA / 30 SpD / 30 Spe (if using HP Fighting)

Modest 228 Spe invested Articuno with Hidden Power Fighting hits 262 Speed total (outspeeds Adamant Monferno at 261 Speed), which means that after an Agility boost, it hits 522 Speed total and outspeeds +2 Adamant 252 Spe Drifblim and Stoutland (518) and everything below.

With this amount of HP investment, it also hits an ideal number of HP for reducing both Life Orb Recoil (329 total) and Stealth Rock damage. Articuno desperately needs an odd number of HP in order to make it so it can switch into Stealth Rock twice without being KO'd.

Some slightly faster spreads can be ran to let Articuno outspeed Scarf Raichu (525) and +3 252 Spe Whirlipede (530) after an Agility, while still letting Articuno run an odd number of HP:

In order to outspeed +1 Timid 252 Spe Raichu (525 Speed total), Articuno can run 24 HP / 252 SpA / 232 Spe.

In order to outspeed +3 Whirlipede, Articuno can run a spread of 8 HP / 252 SpA / 248 Spe to let it hit 267 Speed before an Agility, and 534 after an Agility (again, assuming HP Fighting IVs).

Lastly, it can run 252 SpA / 4 SpD / 252 Spe without Hidden Power Fighting to speed-tie other +2 neutral nature 252 Spe base 85s (i.e. Golduck, Articuno), and outspeed everything below.
Calm Mind Clefairy

Clefairy @ Eviolite
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature

Similar to Kadabra and Duosion, Clefairy is able to run an even number of HP in order to fully maximize its bulk without taking extra from passive forms of damage due to Magic Guard.
Given Clefairy will be powering up with Calm Mind, full investment in both Defense and HP is used here to help increase its overall bulk.
Its last 4 EVs are placed in SpD for the same reason.

Specially Defensive Clefairy

Clefairy @ Eviolite
Ability: Magic Guard
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature

With a Calm Nature and maximum investment in HP and Special Defense, Clefairy is often able to stall out special threats that are depedent on their Life Orbs via Softboiled (Simipour is a great example of this):

252 SpA Life Orb Simipour Hydro Pump vs. 252 HP / 252+ SpD Eviolite Clefairy: 121-144 (35.1 - 41.8%) -- guaranteed 3HKO
252 SpA Life Orb Raichu Thunderbolt vs. 252 HP / 252+ SpD Eviolite Clefairy: 95-113 (27.6 - 32.8%) -- guaranteed 4HKO
252 SpA Life Orb Zebstrika Thunderbolt vs. 252 HP / 252+ SpD Eviolite Clefairy: 87-105 (25.2 - 30.5%) -- guaranteed 4HKO

Clefairy's final 4 EVs are placed in Defense to help increase its overall bulk.
Standard Gourgeist-Super

Gourgeist-Super @ Leftovers / Colbur Berry
Ability: Frisk
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature

Gourgeist-Super should aim to optimize its walling capabilities with maximum Defense and HP.
248 HP gives Gourgeist-Super an odd number of HP, which minimizes passive damage taken.
The remaining EVs are placed in Special Defense to better take resisted hits.

If Gourgeist is not using Seed Bomb, then Gourgeist should run an Atk IV of 0 in order to minimize Confusion and Foul Play damage.

Trick Room Setter Gourgeist-Super

Gourgeist-Super @ Leftovers / Colbur Berry
Ability: Frisk
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Spe

Gourgeist-Super can run an effective set of Trick Room and Explosion in order to clear the field for a Trick Room sweeper to come in for free.
The only difference here is that Gourgeist-Super is running minimum speed with a Relaxed nature and a Speed IV of 0, so that its Explosion (or Destiny Bond) can be used first on the turn after it sets up Trick Room for its teammates.
Standard Politoed

Politoed @ Leftovers
Ability: Water Absorb
EVs: 248 HP / 252 SpA / 8 Spe
*Alternative Spread: 200 HP / 252 SpA / 56 Spe
Modest Nature

Politoed uses full EV investment in its Special Attack stat with a Modest nature in order to wear down the opponent's team with a max power STAB Scald, while still serving as a check to opposing special attackers.
8 Spe EVs can be used to outspeed uninvested Solrock, or you can opt for 56 Spe EVs in order to beat neutral nature 252 Spe base 45s, such as Marowak, Armaldo, and Golem. However, running 56 Speed EVs means that you lose some HP, so the choice is largely based on team composition and whether or not outspeeding these threats is necessary.
This set does not require that you use a Leftovers number, but it is still an option to run 252 HP for that purpose.

Specially Defensive Politoed

Politoed @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 200 SpD / 56 Spe
Calm Nature

252 EVs in HP, along with a Calm Nature and 200 SpDef EVs allow Politoed to check special attackers such as Floatzel, Simipour, and many others.
Placing 56 EVs in its Speed stat allows Politoed to outspeed and Scald neutral nature 252 Spe base 45s, such as Marowak, Golem, and Armaldo before they can make a move.
As a quick note, 252 HP is a Leftovers number; this is directly relevant to this set, as it uses Leftovers in tandem with Protect in order to restore its HP.
Finally, as a last option, Politoed can easily maximize its Defense and HP in order to check physical attackers more effectively (especially if Scald is super effective), such as CB Floatzel, Basculin, Kingler, and others.

Scarf Politoed

Politoed @ Choice Scarf
Ability: Water Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature

Before a Choice Scarf, Timid 252 Spe Politoed hits 262 Speed total, which outspeeds Adamant 252 Spe Monferno (261), and neutral nature 252 Spe base 80s by a couple of points.
After a Choice Scarf has been applied, Timid Politoed hits 393 Speed, which is enough to outspeed +1 Jolly 252 Spe Fraxure (384) and revenge kill it via a faster Ice Beam and some prior damage.

252 SpA Politoed Ice Beam vs. 0 HP / 0 SpD Eviolite Fraxure: 178-210 (65.2 - 76.9%) -- guaranteed 2HKO after Stealth Rock
Mixed Simisear

Simisear @ Life Orb
Ability: Blaze
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
IVs: 29 HP

Naive 252 Spe Simisear (331) outspeeds positive nature 252 Spe base 100s (e.g. Ninetales, Dodrio, etc.), and everything below.
It is only necessary to run 4 EVs in Atk with a Naive nature when using Knock Off or Superpower to beat foes like Regice and Grumpig. This set usually spams special moves though, so full investment in SpA is crucial here.
Lastly, Simisear runs an HP IV of 29 in order to yield an HP number ending in 9 overall, which is ideal for reducing Life Orb recoil.

Nasty Plot Simisear

Simisear @ Life Orb
Ability: Blaze
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 29 HP

Similar to its mixed set, Simisear with Nasty Plot should also maximize its investment in both Speed and Special Attack in order to outspeed positive nature 252 Spe base 100s (328) and hit as hard as possible.
Its remaining EVs are placed in Defense instead of HP in order to give Simisear an odd number of HP overall that minimizes passive forms of damage, like Stealth Rock.
Simisear can also run an HP IV of 29 in order to reduce Life Orb recoil.

Physical AoA Simisear

Simisear @ Life Orb
Ability: Blaze
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
IVs: 29 HP

Like the other sets above, physically based AoA Simisear should also maximize its Speed. However, this spread is used to beat Simisear's usual switch-ins thinking Simisear is running a NP set with a maximum power Knock Off or Rock Slide:

Grumpig:
252 Atk Life Orb Simisear Knock Off (97.5 BP) vs. 248 HP / 8 Def Grumpig: 320-377 (88.1 - 103.8%) -- guaranteed OHKO after Stealth Rock

Swanna:
252 Atk Life Orb Simisear Rock Slide vs. 0 HP / 0 Def Swanna: 255-302 (87.6 - 103.7%) -- guaranteed OHKO after Stealth Rock

Rapidash:
252 Atk Life Orb Simisear Rock Slide vs. 0 HP / 4 Def Rapidash: 234-278 (86.3 - 102.5%) -- guaranteed OHKO after Stealth Rock

Ninetales:
252 Atk Life Orb Simisear Rock Slide vs. 0 HP / 0 Def Ninetales: 221-263 (77 - 91.6%) -- guaranteed OHKO after Stealth Rock

As a final note, Simisear should use an HP IV of 29 in order to optimally reduce Life Orb recoil.
Offensive Defogger Swanna

Swanna @ Life Orb
Ability: Hydration
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature

Timid 252 Spe Swanna hits 324 Speed total, which speed-ties Naive 252 Spe Basculin and outspeeds everything below (e.g. Timid / Jolly 252 Spe Frogadier at 322 Speed, positive nature 252 Spe base 95s, like Leafeon and Sawsbuck at 317 Speed, etc.).
Combined with a Life Orb, the rest of its EVs are placed in Special Attack in order to let Swanna hit as hard as possible with Scald and Hurricane, given Swanna's primary role is to be used as an offensively oriented Defogger with a decent speed stat (which sets it apart from other slower Pokemon with hazard removal, like Lumineon and Vibrava).
Its final 4 EVs are placed in Defense, in order to avoid an even number of HP overall. With an odd number of HP, Swanna is able to switch into Stealth Rock one more time in order to Defog it away for its teammates.
Finally, Swanna has the option of running an HP IV of 29 in order to reduce Life Orb recoil, but this is not necessary, given Swanna normally uses Roost to restore its HP anyway.
NP Ninetales

Ninetales @ Life Orb / Leftovers / Passho Berry
Ability: Flash Fire
EVs: 8 HP / 248 SpA / 252 Spe
Timid Nature

A Timid nature with 252 Speed allows Ninetales to outspeed positive nature 252 Spe base 99s and everything below (e.g. Gourgeist-Small, Basculin, Swanna, etc).
+2 LO Dark Pulse allows Ninetales to break past Grumpig switchins.

Passho Berry is still an option, as this allows Ninetales to take a hit from Basculin's LO Aqua Jet and other Water type hits before OHKOing back with Energy Ball.

252 Atk Life Orb Adaptability Basculin Aqua Jet vs. 0 HP / 0 Def Passho Berry Ninetales: 117-138 (40.7 - 48%) -- guaranteed 3HKO

+2 252 SpA Life Orb Ninetales Dark Pulse vs. 248 HP / 252+ SpD Grumpig: 224-265 (61.7 - 73%) -- guaranteed 2HKO after Leftovers recovery

8 HP are provided to give Ninetales 289 HP total, which is ideal for reducing Life Orb recoil. However, if a different item such as Leftovers or Passho Berry is ran, its standard spread of 252 SpA / 4 SpD / 252 Spe works, as this still provides an odd number of HP with which to switch into Stealth Rock with minimal damage taken.

Toxic Stall Ninetales

Ninetales @ Leftovers
Ability: Flash Fire
EVs: 248 HP / 8 SpD / 252 Spe
Timid Nature

HP and Speed are both maximized, with the remainder of EVs in SpD.
248 HP ensures that Ninetales minimizes damage taken from Stealth Rock.
252 Speed with a Timid nature outspeeds positive nature 252 Spe base 99s and lower (e.g. Gourgeist-Small, Basculin, Swanna, etc.), so that Toxic can be spread to the maximum number of targets / Substitute can be setup on the maximum number of targets before Ninetales faints.

Sub Split Ninetales

Ninetales @ Leftovers
Ability: Flash Fire
EVs: 248 HP / 8 Def / 252 SpD
Calm Nature

Uninvested Ninetales hits 236 speed, which speed-ties positive nature 252 Spe base 58s, like Zweilous and Rampardos. However, 20 Speed EVs can be ran to outspeed neutral nature 252 Spe base 70s by 1 point, such as Mightyena, Lunatone, and Luxray.
HP is given an odd number here to minimize damage from Stealth Rock, and both HP and SpD are maximized to allow Ninetales to tank many special hits, while being able to sponge some physical hits by spreading W-o-W.
Swords Dance Sawsbuck

Sawsbuck @ Life Orb / Salac Berry
Ability: Sap Sipper
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
IVs: 29 HP

Jolly 252 Spe invested Sawsbuck reaches 317 Speed total, and outspeeds Naive 252 Spe Leavanny (311), Timid 252 Spe Chatot (309), Timid 252 Spe Mr. Mime (306), and everything below.
Its remaining EVs are placed in Attack in order to make Sawsbuck as strong as possible with both Swords Dance and Life Orb boosts.
Its final 4 EVs are placed in Defense to yield an odd number of HP overall. It is also given an HP IV of 29, so that it can optimally reduce Life Orb recoil.

Choice Scarf Sawsbuck

Sawsbuck @ Choice Scarf
Ability: Sap Sipper
EVs: 252 Atk / 4 Def / 252 Spe
Jolly / Adamant Nature

+1 Jolly 252 Spe invested Sawsbuck reaches 475 Speed total, and outspeeds +1 Timid 252 Spe Mr. Mime (459), +1 Timid 252 Spe Rotom-F (447), and everything below.
Adamant Sawsbuck has the ability to OHKO strong offensive threats like Ninetales after Stealth Rock if it's switching into a predicted Horn Leech, whereas Jolly Sawsbuck just barely misses this KO:

252+ Atk Sawsbuck Double-Edge vs. 0 HP / 0 Def Ninetales: 228-268 (79.4 - 93.3%) -- guaranteed OHKO after Stealth Rock

Chlorophyll Sweeper Sawsbuck

Sawsbuck @ Life Orb
Ability: Chlorophyll
EVs: 112 HP / 248 Atk / 148 Spe
Adamant Nature

Chlorophyll Sawsbuck's EV spread may seem strange, but it does 3 important things. Firstly, 148 Speed EVs and an Adamant nature are used to outspeed +1 Timid 252 Spe Raichu (525) Speed by 1 point after Chlorophyll has been activated. This makes it so Sawsbuck can OHKO Raichu without being hit by Scarf Raichu's Hidden Power Ice.
Next, Sawsbuck's Attack is maximized via full Attack investment, an Adamant nature, and a Life Orb.
Finally, its remaining EVs are allocated toward its HP stat. It is given 112 HP EVs total, which is an HP stat ending in 9 (therefore, it optimally reduces Life Orb recoil). 4 EVs have to come out of Attack for this though, so 248 EVs in Atk are used with this spread.
The added bulk lets Sawsbuck survive priority hits such as Mightyena's Sucker Punch more easily.

Choice Scarf Raichu's Hidden Power Ice vs 112 HP Adamant Sawsbuck if Sun is not active:
252 SpA Raichu Hidden Power Ice vs. 112 HP / 0 SpD Sawsbuck: 136-162 (41.3 - 49.2%) -- guaranteed 3HKO

In return:
248+ Atk Life Orb Sawsbuck Frustration vs. 0 HP / 0 Def Raichu: 320-376 (122.6 - 144%) -- guaranteed OHKO
248+ Atk Life Orb Sawsbuck Horn Leech vs. 0 HP / 0 Def Raichu: 235-278 (90 - 106.5%) -- 43.8% chance to OHKO

Sun Sawsbuck vs Mightyena:
252+ Atk Life Orb Mightyena Sucker Punch vs. 112 HP / 0 Def Sawsbuck: 195-230 (59.2 - 69.9%) -- guaranteed 2HKO

252+ Atk Life Orb Sawsbuck Frustration vs. 0 HP / 0 Def Mightyena: 265-313 (94.3 - 111.3%) -- 68.8% chance to OHKO
252+ Atk Life Orb Sawsbuck Double-Edge vs. 0 HP / 0 Def Mightyena: 312-368 (111 - 130.9%) -- guaranteed OHKO
Calm Mind Duosion

Duosion @ Eviolite
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk

With Magic Guard making Duosion immune to passive forms of damage, Duosion is free to maximize its HP pool and run an even number of HP.
Calm Mind Duosion should increase its physical bulk as much as possible with 252 EVs placed in Defense with a Bold nature, given Duosion is able to increase its Special Defense and Special Attack manually with Calm Mind.
Its last 4 EVs are placed in Special Defense to increase its overall bulk. However, a slightly faster spread can be ran to outspeed uninvested Stunfisk and Hippopotas at 100 Speed total (therefore, Duosion's spread would be 252 HP / 236 Def / 20 Spe with a Bold nature to hit 101 Speed total).
An Atk IV of 0 is used here to minimize the damage done to Duosion by Foul Play.

Trick Room Attacker Duosion

Duosion @ Eviolite
Ability: Magic Guard / Regenerator
EVs: 252 HP / 252 SpA / 4 SpD
*Alternative Spread: 248 HP / 252 SpA / 8 SpD if Regenerator
IVs: 0 Atk / 0 Spe
Quiet Nature

Trick Room Duosion is slightly different than its Calm Mind variant, in that it trades its bulk for maximum Special Attack via 252 EVs in SpA with a Quiet Nature.
A Speed IV of 0 and a Speed-reducing nature mean that Duosion will be as fast as possible in Trick Room conditions.
Regenerator is an option as it allows Duosion to act as a bulky pivot that uses Trick Room for its teammates. Switching out right after Trick Room is used preserves Duosion and lets it setup Trick Room continually during a match, making 248 HP / 252 SpA / 8 SpD a decent choice as well. Rather than investing 252 EVs into HP with Magic Guard, 248 HP EVs are used with Regenerator to yield an odd number of HP overall, which minimizes passive forms of damage.
Specially Defensive Gogoat

Gogoat @ Leftovers
Ability: Sap Sipper
EVs: 228 HP / 56 Atk / 224 SpD
*Alternative Spread: 244 HP / 16 Atk / 248 SpD with Adamant
Careful Nature / Adamant Nature

16 EVs in Attack and an Adamant nature hits a jump point and has a better chance of OHKOing Ninetales with Earthquake after SR, without the need to obtain a boost via Bulk Up or Sap Sipper.

48 Atk Gogoat Earthquake vs. 0 HP / 0 Def Ninetales: 192-228 (66.8 - 79.4%) -- 37.5% chance to OHKO after Stealth Rock

16+ Atk Gogoat Earthquake vs. 0 HP / 0 Def Ninetales: 204-242 (71 - 84.3%) -- 68.8% chance to OHKO after Stealth Rock

However, its original spread can still be ran in order to tank more hits via Gogoat's high Special Defense stat.

Gogoat with 56 EVs in Attack guarantees an OHKO on Ninetales with Earthquake after it has activated Sap Sipper by taking an Energy Ball (or after it has used Bulk Up). It also has a small chance to OHKO Ninetales without +1, thanks to Stealth Rock damage:

56 Atk Gogoat Earthquake vs. 8 HP / 0 Def Ninetales: 192-228 (66.4 - 78.8%) -- 31.3% chance to OHKO after Stealth Rock
+1 56 Atk
Gogoat Earthquake vs. 8 HP / 0 Def Ninetales: 290-342 (100.3 - 118.3%) -- guaranteed OHKO

In return, Ninetales cannot OHKO Gogoat with its LO boosted Fire Blast:
248 SpA Life Orb Ninetales Fire Blast vs. 228 HP / 224+ SpD Gogoat: 289-343 (65 - 77.2%) -- guaranteed 2HKO after Leftovers recovery

228 HP EVs yields 448 HP overall, which is divisible by 16 and is therefore a Leftovers number.
Gogoat's remaining EVs are used to maximize its Special Defense from here.
Finally, Gogoat also has the option of running 72 Speed EVs to hit 190 Speed, which outspeeds neutral nature 252 Spe base 45s, like Armaldo, Marowak, and Golem by 1 point.
 
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B Rank

Standard Basculin

Basculin @ Life Orb
Ability: Adaptability
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
IVs: 29 HP

Maximum investment in Attack and Speed with a Naive nature grants Basculin as much offensive potential as possible.
When uninvested, Basculin's HP is already an odd number, meaning it would be a waste to invest the leftover EVs in HP; as such, the remaining EVs are placed into SpA to increase Ice Beam's damage.
Naive Basculin's Ice Beam with 4 SpA is used to KO Grass types like Tangela and Leafeon that would normally switch into Basculin to take its Aqua Jets and Waterfalls.

4 SpA Life Orb Basculin Ice Beam vs. 0 HP / 0 SpD Leafeon: 200-237 (73.8 - 87.4%) -- 87.5% chance to OHKO after Stealth Rock and 1 layer of Spikes

4 SpA Life Orb Basculin Ice Beam vs. 252 HP / 0 SpD Eviolite Tangela: 190-226 (56.8 - 67.6%) -- guaranteed 2HKO

A Naughty nature can be used for more power on teams with Sticky Web or paralysis support, but using Naughty outside of these conditions allows Basculin to be outsped by Pokemon from positive nature 252 Spe base 95s (i.e. Sawsbuck and Leafeon at 317 Speed) down to Timid 252 Spe Rotom-F (298).
If one does decide to choose Naughty over Naive, Aqua Tail can be considered for the main attack, as Naughty Aqua Tail hits substantially harder than Jolly Waterfall, offsetting the loss in Speed.

CB Basculin

Basculin @ Choice Band
Ability: Adaptability
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

Basculin can increase its damage output with an Adamant Nature, a Choice Band, and even by using Aqua Tail over Waterfall. While it misses outspeeding Leafeon and Sawsbuck (sans Scarf and Sun), it trades that Speed for the ability to OHKO standard Roselia and other defensive threats with its attacks:

252+ Atk Choice Band Basculin Zen Headbutt vs. 248 HP / 80 Def Eviolite Roselia: 244-288 (80.5 - 95%) -- 50% chance to OHKO after Stealth Rock
Stealth Rock Gabite

Gabite @ Eviolite
Ability: Rough Skin
EVs: 248 HP / 220 Atk / 40 Spe
*Alternative Spread: 248 HP / 8 Atk / 252 SpD with Careful
*Alternative Spread: 248 HP / 8 Atk / 252 Def with Impish
Adamant Nature

Gabite's nice typing allows it to check offensive and defensive threats alike, such as Golem, Stunfisk, Rapidash, Ninetales, Simisear, Pawniard, Vibrava, Arbok, etc.
First, Gabite's HP stat is maximized, while maintaining an odd number of HP in order to reduce passive sources of damage, like Burn, Hail, and Poison.
Next, 40 EVs are allocated toward its Speed stat in order to let it outspeed Adamant 252 Spe Relicanth (209), uninvested Misdreavus (206), other uninvested Gabite (200), Beartic and Regice before being hit by Ice STAB (199), uninvested Grumpig (196) before being Taunted out of SR, and 252 Spe neutral nature base 45's.

Stealth Rock Gabite can also forgo Speed and Attack completely in favor of walling more either on the Special side of the spectrum or on the Physical with spreads of 248 HP / 8 Atk / 252 SpD with a Careful nature, and 248 HP / 8 Atk / 252 Def with an Impish nature, respectively.

Offensive Gabite

Gabite @ Eviolite / Choice Band / Choice Scarf / Life Orb
Ability: Rough Skin
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature / Jolly Nature

Max Speed Jolly Gabite hits 289 Speed and outspeeds Jolly 252 Spe Monferno (287), positive nature 252 Spe base 80s (i.e. Grumpig, Stoutland at 284 Speed), and everything below.
If running Adamant, Gabite still hits 263 Speed, and outspeeds Adamant 252 Spe Monferno (261), neutral-natured 252 Spe base 80s (259), and everything slower.
Doing so allows Gabite to set SR before it is fainted, or hit these aforementioned targets with a STAB Outrage or Earthquake. For example, both Arbok and Monferno are OHKOed by Earthquake, while Outrage does a fair amount of damage to Stoutland and survives CB Frustration in return:

252+ Atk Gabite Earthquake vs. 0 HP / 4 Def Eviolite Monferno: 312-368 (115.9 - 136.8%) -- guaranteed OHKO

252+ Atk Gabite Outrage vs. 0 HP / 0 Def Arbok: 228-268 (87.3 - 102.6%) -- 93.8% chance to OHKO after Stealth Rock
252+ Atk Gabite Earthquake vs. 0 HP / 0 Def Shuca Berry Arbok: 189-223 (72.4 - 85.4%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Gabite Earthquake vs. 0 HP / 0 Def Arbok: 378-446 (144.8 - 170.8%) -- guaranteed OHKO

252+ Atk Gabite Outrage vs. 0 HP / 0 Def Stoutland: 183-216 (58.8 - 69.4%) -- guaranteed 2HKO after Stealth Rock

252+ Atk Choice Band Stoutland Return vs. 0 HP / 4 Def Eviolite Gabite: 229-271 (82.6 - 97.8%) -- guaranteed 2HKO

It can also use a Choice Scarf set, allowing it to outspeed Pokemon such as Simipour and Dodrio in order to deal a lot of damage. A Choice Band or Life Orb set could also be used, allowing it to deal a lot of damage to bulkier Pokemon such as Tangela and Gourgeist-XL.
Swift Swim Sweeper Golduck

Golduck @ Life Orb
Ability: Swift Swim
EVs: 252 SpA / 4 SpD / 252 Spe
*Alternative Spread: 32 HP / 248 SpA / 228 Spe
Modest Nature

Before a Rain Dance, Modest 252 Spe invested Golduck hits 269 Speed, and outspeeds Jolly 252 Spe Solrock (262), Adamant 252 Spe Monferno (261), neutral-natured 252 Spe base 80s (e.g. Drifblim, Stoutland, etc. at 259), and everything below.
After a Rain Dance, +2 Modest 252 Spe Golduck hits 538 Speed total, outspeeding the entire metagame, outside of other weather-boosted threats like positive-natured 252 Spe Floatzel in the Rain (722).

As a slightly bulkier alternative, Golduck can drop a few points in Speed in order to outspeed Jolly 252 Spe Solrock by 1 point (i.e. a spread of 32 HP / 248 SpA / 228 Spe with a Modest Nature).

While this spread looks somewhat strange, it accomplishes several things; firstly, it gives Golduck an HP stat ending in 9, which optimally reduces Life Orb recoil. Secondly, this allows Golduck to hit 526 Speed after Swift Swim has activated (263 before), which outspeeds Scarf Raichu by 1 point. And thirdly, rather than wasting the EVs in Speed by attempting to outspeed +3 Whirlipede and speed-tie other +2 neutral-natured 252 Spe base 85s (i.e. Golduck, Articuno), it gives Golduck an extra bit of bulk to live through various hits as it sets up with Rain Dance.

4 EVs had to come out of Special Attack in order to ensure Golduck would run an odd number of HP (at 309 HP total), while simultaneously not wasting any EVs in Speed.
SubSeed Gourgeist-Small

Gourgeist-S @ Leftovers
Ability: Frisk
EVs: 152 HP / 104 Def / 252 Spe
Jolly / Timid Nature

Maximum Speed investment is used so that Gourgeist-Small can outspeed positive-natured 252 Spe invested base 98s (i.e. Basculin, Swanna at 324 Speed) and everything below.
The given HP EVs allow Gourgeist-Small to restore as much HP as possible via Leech Seed and Leftovers, while yielding an odd number overall; the rest of its EVs are placed in Defense for the added bulk.
While a Jolly nature is recommended if Gourgeist-Small is carrying Rock Slide, a Timid nature with an Atk IV of 0 is best when Disable or Foul Play are being used in order to reduce the damage done to Gourgeist-Small by both Confusion and Foul Play.

Scarf Gourgeist-Small

Gourgeist-Small @ Choice Scarf
Ability: Frisk
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature

Normally, Gourgeist-Small runs 326 Speed. With a Choice Scarf however, it hits 489 Speed, which allows it to stop the following threats (and everything slower) with either a super-effective Rock Slide, Seed Bomb, or simply with Destiny Bond: +1 Jolly 252 Spe Sawsbuck (475), +1 Timid 252 Spe Mr. Mime (459), +1 Timid 252 Spe Rotom-Frost (447), and +1 Modest 252 Spe Chatot (420).
On this set, given Gourgeist-Small is acting as a revenge killer, it should run maximum Attack after it has maxed out its Speed.
Its remaining 4 EVs should be placed in either Defense or Special Defense in order to avoid an even number of HP overall.
Standard Hippopotas

Hippopotas @ Smooth Rock
Ability: Sand Stream
EVs: 248 HP / 252 Def / 4 SpD / 4 Spe
Impish Nature

Hippopotas should be ran defensively in order to produce as many chances for a sweep as possible for Stoutland and other Sandstorm sweepers. Therefore, Hippopotas runs maximum HP and Defense with an Impish Nature.
In order to reduce passive forms of damage later on in the battle, Hippopotas should run an odd number of HP overall, and then split the remaining 8 EVs between Speed and Special Defense.
4 EVs in Speed is encouraged as it lets Hippopotas outspeed uninvested Stunfisk by 1 point and hit it with a STAB Earthquake.

Eviolite Hippopotas

Hippopotas @ Eviolite
Ability: Sand Force
EVs: 248 HP/ 128 Def / 132 SpD
Impish Nature

A mixed defensive spread with maximum HP, and an Impish nature allow Hippopotas to tank some hits from certain meta-defining threats. For example, with this spread, Hippopotas avoids the 2HKOes from Zebstrika's HP Ice and Kadabra's Psychic.
On the physical end of the spectrum, Hippopotas also avoids the 2HKO from CB Dodrio's Frustration and Rapidash's LO Flare Blitz.

252 SpA Life Orb Zebstrika Hidden Power Grass vs. 248 HP / 132 SpD Eviolite Hippopotas: 130-153 (38.3 - 45.1%) -- guaranteed 3HKO

252 SpA Kadabra Psychic vs. 248 HP / 132 SpD Eviolite Hippopotas: 144-169 (42.4 - 49.8%) -- guaranteed 3HKO

252 Atk Choice Band Dodrio Return vs. 248 HP / 128+ Def Eviolite Hippopotas: 142-168 (41.8 - 49.5%) -- guaranteed 3HKO

252 Atk Life Orb Rapidash Flare Blitz vs. 248 HP / 128+ Def Eviolite Hippopotas: 136-161 (40.1 - 47.4%) -- guaranteed 3HKO
Offensive Shift Gear Klang

Klang @ Eviolite
Ability: Clear Body
EVs: 120 HP / 252 Atk / 136 Spe
Adamant Nature

Klang's old spread of 252 HP / 156 Def / 24 SpD / 76 Spe is largely outdated, as this was built to survive LO Tauros' Earthquake after Stealth Rock, and to avoid being 2HKO'd by Specs Raichu's Thunderbolt. Tauros is banned and Specs Raichu is outclassed by Life Orb and Choice Scarf sets, so I've provided a new spread for Klang.

The threats Klang needs to outspeed is first based on your team's needs. For example, in order to outspeed Chatot after a Shift Gear by 1 point, it should invest 76 EVs into Speed (i.e. 155 Spe pre Shift Gear, 310 after the boost). In order to outspeed Dodrio, it should run 120 Spe EVs (while maintaining an odd number of HP) to hit 332 Speed after a Shift Gear. Finally, the given spread allows Klang to outspeed Timid 252 Spe Kadabra and other positive nature 252 Spe base 105s by letting Klang hit 340 Speed after a Shift Gear.

Its remaining EVs are placed in HP for some added bulk, while yielding an odd number of HP, so as to not increase passive forms of damage taken.

A more defensive (or specially defensive) spread can be used with Rest / Sleep Talk / Shift Gear / Gear Grind with either an Impish or a Careful nature respectively, but an Adamant nature with the given spread and 3 attacks maximizes its offensive capabilities.

RestTalk Klang

Klang @ Eviolite
Ability: Clear Body
EVs: 252 HP / 156 Def / 100 SpD
Careful Nature

Klang maximizes its mixed bulk first by investing 252 EVs into HP, and then spreads the rest of its EVs evenly between each defense to prevent as many offensive threats as possible from OHKOing or 2HKOing Klang before it is able to setup with Shift Gear. Uninvested Klang hits 136 Speed, and therefore can run slightly more Speed in order to outspeed Lickilicky if Klang is unboosted. However, most of the time, Klang will be able to power up via Shift Gear, which makes Speed investment somewhat pointless.
Klang does not need an odd number of HP, because Klang refills its HP with Rest and so reducing the damage it takes from passive sources isn't nearly as imperative.

CB Klang

Klang @ Choice Band
Ability: Clear Body
EVs: 24 HP / 252 Atk / 232 Spe
Adamant Nature

Klang can use a Choice Band, so that it doesn't require 1 turn of setting up or weakening / fainting Klang's checks and counters before setting up.
Choice Band Klang should first maximize its Attack by using an Adamant Nature, a Choice Band and by investing 252 EVs into its Attack stat.
232 EVs in Speed make Klang hit 194 Speed, which is enough to outspeed Pokemon who sometimes speed creep neutral nature 252 Spe base 45s by a few points, such as Roselia, and all other neutral nature 252 Spe base 45's that hit 189 Speed total (i.e. Marowak, Armaldo, Golem, Wigglytuff).
Finally, its last 24 EVs are allocated toward its bulk.

CB Klang can prove to be useful by hitting through Focus Sash or Sturdy Pokemon with a +1 252+ Gear Grind. It is also able to OHKO or 2HKO many walls, which provide defensive glue for various types of teams:

252+ Atk Choice Band Klang Gear Grind (2 hits) vs. 4 HP / 0 Def Kadabra: 476-564 (214.4 - 254%) -- guaranteed OHKO
252+ Atk Choice Band Klang Gear Grind (2 hits) vs. 0 HP / 0 Def Golem: 312-372 (103.6 - 123.5%) -- guaranteed OHKO
252+ Atk Choice Band Klang Gear Grind (2 hits) vs. 252 HP / 128 Def Eviolite Roselia: 194-230 (63.8 - 75.6%) -- guaranteed 2HKO
252+ Atk Choice Band Klang Gear Grind (2 hits) vs. 248 HP / 8 Def Venipede: 294-348 (111.7 - 132.3%) -- guaranteed OHKO
252+ Atk Choice Band Klang Gear Grind (2 hits) vs. 248 HP / 0 Def Grumpig: 276-326 (76 - 89.8%) -- approx. 6.3% chance to OHKO after Stealth Rock
252+ Atk Choice Band Klang Gear Grind (2 hits) vs. 0 HP / 4 Def Armaldo: 388-460 (133.3 - 158%) -- guaranteed OHKO
Sticky Web Lead Leavanny

Leavanny @ Focus Sash
Ability: Overcoat
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature

Naive 252 Spe invested Leavanny (311) outspeeds Timid 252 Spe Chatot (309), Timid 252 Spe Mr. Mime (306), and everything below. Leavanny should always run maximum Speed in order to setup Sticky Web before it's KO'd.
The rest of its EVs are used to maximize its Special Attack, so that it can hit hard with Leaf Storm.
The final 4 EVs are used together with a Naive nature to ensure that Knock Off also does as much damage as possible. These last 4 EVs should not be placed in HP, as that would yield an even number of HP and therefore increase Stealth Rock damage done to Leavanny.
Standard Purugly

Purugly @ Life Orb / Silk Scarf
Ability: Defiant
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

This greedy corporate fatcat oppresses the rest of PU with both its access to priority and its great Speed stat of 355. Assuming Purugly is Jolly and 252 Spe invested, it outspeeds positive nature 252 Spe base 110s (i.e. Jumpluff, Raichu at 350 Speed), +1 Jolly 252 Spe Ursaring (343), positive nature 252 Spe base 105s (i.e. Electabuzz, Cyrogonal, Kadabra, Rapidash at 339 Speed), and everything below.
Its remaining EVs are allocated toward its decent Attack stat. Combined with a possible Defiant Boost and a Life Orb or a Silk Scarf, Purugly can become quite threatening rather quickly.
Its last 4 EVs are placed in Defense in order to avoid an even number of HP.
Defensive Solrock

Solrock @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature

Solrock's high Defense, access to Will-O-Wisp, reliable recovery in Morning Sun, and rare typing allow it to check premier physically based threats in PU, such as Stoutland, Golem, Rapidash, Intimidate Arbok, and many others. Therefore, in order to optimize its abilities as a physical wall, its HP and Defense stats should be fully maximized without giving it an even number of HP.
Its remaining 8 EVs are placed in Special Defense in order to increase its mixed bulk.

Screens Solrock

Solrock @ Light Clay
Ability: Levitate
EVs: 248 HP / 8 Atk / 252 Spe
Jolly Nature

Maximally invested Speed and a Jolly nature allow Solrock to hit 262 Speed total, which outspeeds neutral-natured Adamant 252 Spe Monferno (261), neutral-natured 252 Spe base 80s (e.g. Drifblim, Stoutland, Arbok, etc. at 259 Speed), Jolly 252 Spe Fraxure (256), and everything below. It is important to run maximum Speed on Screens Solrock so that it can setup a Screen or Stealth Rock before the opponent faints Solrock.
Similarly, running 248 EVs in HP also increases the chance Solrock can successfully setup Stealth Rock or a Screen by improving its mixed bulk.
Its remaining EVs are placed in Attack in order to slightly boost the power of Solrock's Explosion.
Suicide Spiker Venipede

Venipede @ Focus Sash
Ability: Speed Boost
EVs: 248 HP / 8 Def / 252 Spe
Jolly Nature

The benefit of using Venipede over Whirlipede is that it's slightly faster with its Speed stat of 234 (as opposed to Whirlipede's initial Speed of 212).
After 1 Speed boost, it hits 351 Speed, which is just enough to outspeed positive nature 252 Spe base 110s, like Jumpluff and Raichu (350). Outspeeding the Pokemon between 351 Speed and 318 Speed is really the reason to use Venipede over Whirlipede.
After 2 Speed boosts, it hits 468 Speed total, which is enough to outspeed +1 Timid 252 Spe Mr. Mime (459), and +1 Timid 252 Spe Rotom-F (447).
After 3 Speed boosts, Venipede hits 585 Speed, which outspeeds every boosted Pokemon in PU, except for +2 Timid 252 Spe Swoobat (718), or positive-natured 252 Spe Floatzel in the Rain with Swift Swim (722).

Its remaining EVs are placed in HP, without giving Venipede an even number of HP in case it needs to switch back in again.
Its final 8 EVs are placed in Defense for some added bulk (although these EVs are not necessary, given Venipede will be using Endeavor anyway).
B- Rank

Offensive Spinner Armaldo

Armaldo @ Lum Berry / Leftovers
Ability: Battle Armor / Swift Swim
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature / Adamant nature

Adamant 252 Spe invested Armaldo hits 189 Speed total, and speed ties with Marowak, Golem, Wigglytuff and other Adamant 252 Spe Armaldo, while outspeeding neutral nature 0 Spe base 70s (e.g. Luxray, Politoed, Solrock, etc. at 176 Speed), neutral nature 0 Spe Gogoat (172), and neutral nature 0 Spe base 65s (i.e. Pelipper, Roselia at 166 Speed).

If a Jolly nature is ran, Armaldo is able to outspeed and OHKO neutral nature 0 Spe Grumpig (196), neutral nature 252 Spe Regice and Beartic (199) with the appropriate attacks.

252 Atk Armaldo X-Scissor vs. 248 HP / 8 Def Grumpig: 356-422 (98 - 116.2%) -- 87.5% chance to OHKO
252 Atk Armaldo Stone Edge vs. 248 HP / 8 Def Regice: 318-374 (87.6 - 103%) -- 18.8% chance to OHKO
252 Atk Armaldo Stone Edge vs. 32 HP / 8 Def Beartic: 380-450 (112 - 132.7%) -- guaranteed OHKO

However, an Adamant nature is still recommended because not being able to always 2HKO Misdreavus on the switch-in with Knock Off or OHKO Drifblim on the switch-in is a huge letdown.

252 Atk Armaldo Knock Off (97.5 BP) vs. 252 HP / 240 Def Eviolite Misdreavus: 150-178 (46.2 - 54.9%) -- 63.7% chance to 2HKO
252+
Atk Armaldo Knock Off (97.5 BP) vs. 252 HP / 240 Def Eviolite Misdreavus: 166-196 (51.2 - 60.4%) -- guaranteed 2HKO

252 Atk Armaldo Knock Off (97.5 BP) vs. 12 HP / 32 Def Drifblim: 372-438 (83.7 - 98.6%) -- guaranteed 2HKO
252+
Atk Armaldo Knock Off (97.5 BP) vs. 12 HP / 32 Def Drifblim: 408-480 (91.8 - 108.1%) -- 50% chance to OHKO

Similarly, Armaldo misses out on the guaranteed OHKO after Stealth Rock on Pelipper if it runs Jolly over Adamant.

252 Atk Armaldo Stone Edge vs. 248 HP / 252+ Def Pelipper: 230-272 (71.2 - 84.2%) -- 62.5% chance to OHKO after Stealth Rock
252+
Atk Armaldo Stone Edge vs. 248 HP / 252+ Def Pelipper: 254-300 (78.6 - 92.8%) -- guaranteed OHKO after Stealth Rock

The Last 4 EVs are placed in Def here rather than HP to allow Armaldo to switch into Stealth Rock one more time to Rapid Spin.

Swift Swim Sweeper Armaldo

Armaldo @ Life Orb / Lum Berry
Ability: Swift Swim
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

In a Rain Dance, +2 Adamant 252 Spe invested Armaldo hits 378 Speed total, which outspeeds the entire unboosted metagame, save for Timid 252 Spe Electrode and Adamant 252 Spe Ninjask.
Adamant should be ran over Jolly, because running a Jolly nature with 252 Spe only outspeeds +2 neutral nature 252 Spe base 50s (Beartic, Regice) at 398 Speed and +1 Jolly 252 Spe Fraxure at 384 Speed. Given the significant drop in Attack with a Jolly nature, Adamant should always be ran on Swift Swim sets.
If Armaldo is using a Life Orb, it should use an HP IV of 29 to minimize Life Orb recoil.
Its last 4 EVs are placed in Defense rather than HP in order to produce an odd number of HP, which minimizes passive forms of damage like Stealth Rock.
Offensive Dusknoir

Dusknoir @ Choice Band / Spell Tag
Ability: Frisk
EVs: 208 HP / 252 Atk / 4 Def / 44 Spe
*Alternative Spread: 88 HP / 252 Atk / 168 Spe
Adamant Nature

Dusknoir should maximize Attack first, hit its desired Speed second, and place the remaining EVs into HP without giving Dusknoir an even number of HP third. So that Dusknoir can run an odd number of HP to reduce various forms of passive damage, 4 EVs are taken out of its HP stat and reallocated toward Defense.
44 EVs in Speed (137 Speed total) allow Dusknoir to outspeed uninvested base 50 Pokemon such as Lickilicky and Carbink and possibly cripple them via Trick for the rest of the match.
Other faster EV spreads are viable; 168 Speed EVs let Dusknoir outspeed uninvested Pelipper and Roselia. Outspeeding Pelipper and Roselia is viable, as Dusknoir's last coverage move is normally either Thunder Punch or Ice Punch.
Spell Tag is used when WoW is used in conjunction with 3 Attacks. Otherwise, a Choice Band is Dusknoir's item of choice here (no pun intended).
CoilPass Huntail

Huntail @ Leftovers / Rindo Berry / Wacan Berry
Ability: Water Veil / Swift Swim
EVs: 248 HP / 32 SpD / 228 Spe
Jolly Nature

On Huntail's CoilPass set, maximum HP investment increases Huntail's mixed bulk, allowing it to set up more easily before passing stat boosts, while minimizing damage taken from Stealth Rock and other passive sources via an odd HP number.
Using 32 EVs in SpD can let Huntail survive Zebstrika's Volt Switch 100% of the time, and give it a higher chance to survive Raichu's as well.

252 SpA Life Orb Raichu Volt Switch vs. 248 HP / 32 SpD Huntail: 283-335 (90.4 - 107%) -- 37.5% chance to OHKO
252 SpA Life Orb Raichu Volt Switch vs. 248 HP / 8 SpD Huntail: 291-346 (92.9 - 110.5%) -- 56.3% chance to OHKO
252 SpA Life Orb Raichu Volt Switch vs. 252 HP / 0 SpD Huntail: 296-351 (94.2 - 111.7%) -- 68.8% chance to OHKO

252 SpA Life Orb Zebstrika Volt Switch vs. 248 HP / 32 SpD Huntail: 265-312 (84.6 - 99.6%) -- guaranteed 2HKO
252 SpA Life Orb Zebstrika Volt Switch vs. 248 HP / 8 SpD Huntail: 273-322 (87.2 - 102.8%) -- 18.8% chance to OHKO

Shell Smash Huntail

Huntail @ Life Orb
Ability: Water Veil / Swift Swim
EVs: 56 Atk / 252 SpA / 200 Spe
Rash Nature
IVs: 29 HP

The Given EVs allow Huntail to hit 199 Speed before its Shell Smash in order to outpace neutral nature 252 Spe invested base 45s, like Armaldo, Golem and Marowak. After a Shell Smash, Huntail hits 386 Speed, which allows it to outspeed Timid 252 Spe Zebstrika (364), and everything below.
Maximum investment in Special Attack with a Life Orb allows Huntail to do as much damage as possible with Ice Beam and Surf after a Shell Smash.
Its final 56 EVs are placed in Attack in order to ensure faster targets (e.g. Ninjask, Choice Scarf Raichu, etc.) are OHKO'd by its Life Orb boosted Sucker Punch.
Huntail needs a more offensive spread in order to score its OHKOs, so using a Naive nature instead of a Rash nature is discouraged here. Additionally, +2 Naive 252 Spe Huntail only reaches 446 Speed, which is outsped by Choice Scarf Rotom-F by one point. This means the extra investment in its Speed stat is not worth it, and should therefore stick to maximizing both its attacking stats.
Lastly, an HP IV of 29 gives it an HP stat ending in 9, which is ideal for reducing Life Orb recoil.
Sucker Punch calculations:
+2 56 Atk Life Orb Huntail Sucker Punch vs. 0 HP / 0 Def Raichu: 264-311 (101.1 - 119.1%) -- guaranteed OHKO
+2 56 Atk Life Orb Huntail Sucker Punch vs. 0 HP / 0 Def Ninjask: 305-360 (115.9 - 136.8%) -- guaranteed OHKO

Surf Calculations:
252+ SpA Life Orb Huntail Surf vs. 0 HP / 0 SpD Marowak: 406-478 (155.5 - 183.1%) -- guaranteed OHKO
252+ SpA Life Orb Huntail Surf vs. 0 HP / 0 SpD Armaldo: 406-478 (139.5 - 164.2%) -- guaranteed OHKO
+2 252+ SpA Life Orb Huntail Surf vs. 248 HP / 8 SpD Pelipper: 222-261 (68.7 - 80.8%) -- 50% chance to OHKO after Stealth Rock
Agility Kingler

Kingler @ Life Orb
Ability: Hyper Cutter
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
IVs: 29 HP

Before an Agility, Adamant 252 Spe Kingler hits 249 Speed and outspeeds uninvested Meowstic-M (244), neutral nature 252 Spe base 70s (i.e. Lunatone, Luxray, and Mightyena at 239 Speed), and everything below.
While it may seem that Kingler can run less Speed, Kingler should still run 252 EVs in Speed because it hits 498 total after one Agility. This is enough to outspeed +1 Timid 252 Spe Simipour (496), +1 Jolly 252 Spe Dodrio (492), +1 Jolly 252 Spe Sawsbuck (475), and everything below.
Kingler has the option of running a Jolly nature here in order to hit 546 Speed after an Agility in order to outspeed +2 neutral nature 252 Spe base 85s like Articuno and Golduck, but it's generally considered to be inferior for the purpose of sweeping because the loss in power is noticeable. However, running Jolly in tandem with LO boosted Superpower lets you check Stoutland, so it's still an option.
Kingler's last EVs should be placed in one of its Defense stats to avoid an even number of HP. Similarly, it can use an odd number of HP ending in 9 to optimally reduce Life Orb recoil and passive damage.
Calm Mind Murkrow

Murkrow @ Eviolite
Ability: Prankster
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature

Calm Mind Murkrow should first maximize its Defense stat, given it will be using Calm Mind in conjunction with Prankster to boost its Special Defense before being hit.
248 EVs in HP yields an odd number of HP overall and should therefore be used in order to minimize damage taken from Stealth Rock.
The remaining 8 EVs should be placed in SpD for some added bulk.

Life Orb Murkrow

Murkrow @ Life Orb
Ability: Prankster
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
IVs: 29 HP

Naive 252 Spe invested Murkrow hits 309 Speed total, and speed-ties with Timid 252 Spe Chatot. It also outspeeds Timid 252 Spe Mr. Mime (306), +2 Timid 252 Spe Torkoal (304), and everything below.
252 Atk EVs with a Life Orb allow Mixed Murkrow to hit as hard as possible. A Naive nature with 4 EVs in SpA are used in order to avoid a decrease in damage in either HP Grass / Fighting or Heat Wave.
Finally, an HP IV of 29 gives it an HP stat ending in 9 overall, which is ideal for reducing Life Orb recoil.
Standard Vibrava

Vibrava @ Eviolite
Ability: Levitate
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature

Vibrava's Eviolite boosted bulk and great typing allow Vibrava to check or counter special attackers such as Ninetales, Non-Hidden Power Ice Zebstrika, Probopass, Stunfisk and many others. In order to take advantage of these assets, Vibrava should run 248 EVs in HP, along with maximized Special Defense and a Careful nature. Its remaining 8 EVs should be placed in Defense to increase its mixed bulk.
While not nearly as effective, Vibrava can also run a more physically defensive set in order to check Pokemon like Rapidash and Golem more easily.
Weather Support Volbeat

Volbeat @ Heat Rock / Damp Rock
Ability: Prankster
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature
IVs: 0 Spe

Maximum investment in HP and Defense lets Volbeat sponge hits more effectively.
A Relaxed nature and a Speed IV of 0 are both used to minimize Volbeat's Speed, so that its slow U-Turn can bring in Weather based sweepers for free.
248 HP EVs produce an odd number of HP overall, which is ideal for reducing damage when switching into Stealth Rock.
Its final 8 EVs are placed in Special Defense in order to improve Volbeat's durability.
The choice in item is based on its moveset; Heat Rock for sets with Sunny Day, and Damp Rock for sets with Rain Dance.
Choice Band Zweilous

Zweilous @ Choice Band
Ability: Hustle
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

Adamant Zweilous with 252 EVs in Attack and a Choice Band acts as a nuke (albeit, one with poor accuracy) and obliterates literally any unboosted wall in PU. For example, its CB boosted Superpower is enough to OHKO Avalugg after Stealth Rock.

252+ Atk Choice Band Hustle Zweilous Superpower vs. 248 HP / 8 Def Avalugg: 282-332 (71.7 - 84.4%) -- 68.8% chance to OHKO after Stealth Rock

After its Attack has been maximized, the rest of its EVs are placed in Speed to allow it to hit 215 Speed total, which outspeeds almost every notable wall in PU (e.g. uninvested Gogoat, Pelipper, Roselia, Tangela, Vullaby, Quilladin, Gourgeist-Super, etc.).
Its final 4 EVs are placed in Defense instead of in HP, so as to yield an odd number of HP overall, which reduces passive forms of damage like Stealth Rock.

RestTalk Zweilous

Zweilous @ Eviolite
Ability: Hustle
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature

With maximum investment in HP and Special Defense, coupled with an Eviolite, RestTalk Zweilous is able to become a dedicated special wall that top tier special threats like Nasty Plot LO Ninetales cannot handle. For example, +2 LO Ninetales' Fire Blast only has an 8.8% chance to 3HKO 248 HP / 252 SpD Careful Eviolite Zweilous:

+2 252 SpA Ninetales Fire Blast vs. 248 HP / 252+ SpD Eviolite Zweilous: 78-93 (22.4 - 26.8%) -- 28.3% chance to 4HKO
+2
252 SpA Life Orb Ninetales Fire Blast vs. 248 HP / 252+ SpD Eviolite Zweilous: 101-121 (29.1 - 34.8%) -- 8.8% chance to 3HKO

In return, Zweilous' uninvested Crunch 2HKO's Ninetales:
0 Atk Hustle Zweilous Crunch vs. 8 HP / 0 Def Ninetales: 144-169 (49.8 - 58.4%) -- 99.6% chance to 2HKO

248 EVs in HP gives Zweilous an odd number of HP (though it is not completely necessary to do this, given this Zweilous will be using Rest). Its final 8 EVs are placed in Defense for some extra bulk.

C+ Rank and lower

Standard Avalugg

Avalugg @ Leftovers
Ability: Sturdy
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature

248 HP EVs maximize Avalugg's bulk, while minimizing the amount of damage Avalugg takes from Stealth Rock.
252 Special Defense EVs with a Careful nature patch up Avalugg's mediocre Special Defense.
An Impish nature can be used to increase Avalugg's defense a bit and give more insurance against physical threats such as Ursaring and Stoutland, but using maximum Defense investment is not recommended, as Avalugg will take only marginally less damage from physical attacks, while taking significantly more damage from special attacks.
Rain Sweeper Beartic

Beartic @ Life Orb
Ability: Swift Swim
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
IVs: 29 HP

Before Rain Dance has been used, Adamant 252 Spe Beartic hits 199 Speed. However, with Swift Swim activated, Beartic reaches 398 Speed total, and outpaces the unboosted PU meta, outside of CB Ninjask (419) and the rarely used Timid 252 Spe Electrode (416).
Given Rain Dance lets it outspeed most Pokemon already, it should maximize its Attack in order to increase its wall breaking capabilities.
This Beartic should run an HP stat ending in 9, so that Life Orb recoil is reduced. Similarly, it should also run an odd number of HP, so that it can switch into Stealth Rock one more time.
Choice Specs Beheeyem

Beheeyem @ Choice Specs
Ability: Analytic
EVs: 212 HP / 252 SpA / 44 Spe
Modest Nature
IVs: 0 Atk

44 Speed EVs allow Beheeyem to outspeed an uninvested Machoke and Armaldo so Beheeyem can hit them with a Psychic or Psyshock before they can use Knock Off. Running a small amount of Speed does not limit Beheeyem's effectiveness, given Beheeyem is slow even with 44 Spe EVs. Analytic will also still activate when the opposing Pokemon switches out anyway.

252+ SpA Choice Specs Beheeyem Psychic vs. 248 HP / 0 SpD Armaldo: 283-334 (80.1 - 94.6%) -- guaranteed 2HKO
252+ SpA Choice Specs Beheeyem Psychic vs. 160 HP / 44 SpD Eviolite Machoke: 444-524 (130.2 - 153.6%) -- guaranteed OHKO

252 Special Attack EVs with a Modest nature, Analytic and Choice Specs maximize Beheeyem's damage output.
The leftover EVs are placed in HP to make Beheeyem more capable of taking hits. An Attack IV of 0 makes it so Beheeyem minimizes damage taken from Foul Play and Confusion.

Trick Room Sweeper Beheeyem

Beheeyem @ Life Orb
Ability: Analytic
EVs: 248 HP / 252 SpA / 8 SpD
Quiet Nature
IVs: 0 Atk / 0 Spe

Trick Room Beheeyem's EV spread is slightly different and minimizes its Speed stat as much as possible via a Speed IV of 0 and a Quiet Nature over a Modest one in order to take advantage of Trick Room. When Beheeyem runs Trick Room, the EVs normally placed in Speed can be reallocated to HP to better sponge hits.
If Beheeyem itself is using Trick Room, Life Orb is used to switch between Trick Room and its attacks. However, if Beheeyem is not using Trick Room, its usual item of Choice Specs is still a fine choice.
Eviolite Electabuzz

Electabuzz @ Eviolite
Ability: Static / Vital Spirit
EVs: 24 HP / 232 SpA / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk / 30 Def

Investing 24 EVs in HP guarantees the 3HKO on Eviolite Electabuzz from Raichu's LO Focus Blast after SR.
After this benchmark in bulk has been hit, it should maximize its Speed via a Timid nature and full 252 EV investment, and then place the remainder of its EVs in Special Attack.
The given IVs give Electabuzz a 60 BP Hidden Power Ice, while minimizing its Attack so that it takes less from Foul Play and confusion damage.
Choice Scarf Electabuzz

Electabuzz @ Choice Scarf
Ability: Static / Vital Spirit
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk / 30 Def

Electabuzz before a Choice Scarf reaches 339 Speed, which Speed ties Kadabra and Rapidash, while outspeeding everything slower.
After a Choice Scarf has been applied, Electabuzz reaches 508 Speed total, which is enough to outspeed +2 Adamant 252 Spe Kingler (498), +1 positive nature 252 Spe base 101s (i.e. Simipour, Simisage, and Simisear at 496), +1 Modest 252 Spe Floatzel (493), and everything slower.
Wallbreaker Marowak

Marowak @ Thick Club
Ability: Rock Head / Battle Armor
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

Thick Club doubles Marowak's Attack, so its Attack stat should be maximized in order to make the most of its held item. With an Adamant nature, 252 EVs in Atk and a Thick Club, Marowak's Attack reaches 568, whereas with a Jolly nature, it loses a total of 50 Attack in exchange for a gain of 18 Speed.
Normally, Adamant 252 Spe Marowak is used to speed-tie other neutral nature 252 Spe invested base 45s like Golem and outspeed anything slower than 189 Speed. However, Jolly is still an option to outspeed and prevent Golem from setting Stealth Rock by KOing it with Bonemerang before Golem can make a move.
Similarly, Jolly 252 Spe Marowak is able to outspeed Pokemon who speed creep these base 45s, like Modest / Calm 96 Spe Roselia, or Bold / Modest 96 Spe Pelipper.
Additionally, Jolly 252 Spe Marowak (207 Speed) outspeeds Calm 8 Spe Grumpig (198), and neutral nature 252 Spe base 50s like Regice and Beartic (199). If your team is weak to Roselia, Regice, Beartic, or doesn't have anything with which to OHKO Pelipper or specially defensive Grumpig, it may be worth it to run Jolly on Marowak. Otherwise, Adamant should be the nature of choice for Marowak.
In the same way that it can run Jolly, Marowak also has the option of retaining some bulk by running a slightly slower spread of 212 HP / 252 Atk / 44 Spe to outspeed Lickilicky.
Defensive Screens Meowstic

Meowstic (M) @ Light Clay
Ability: Prankster
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
IVs: 0 Atk

Meowstic without an attack, while it is Taunt fodder, is effective at spreading Paralysis, forcing switches with Yawn, and setting up Screens for its teammates. Given this set does not use Psychic, its Defense is maximized via 248 EVs in HP and 252 EVs in Defense with a Bold nature.
248 EVs in HP yields an odd number, and makes it so Meowstic does not take extra damage from passive sources.
Its final 8 EVs are placed in Special Defense, in order to give it a bit more bulk on the special end of the spectrum.
Alternatively, Meowstic can run maximum Special Defense, but then it'd be easily KO'd by physical Dark type threats, like Mightyena.
An Attack IV of 0 is used to minimize damage from both Confusion and Foul Play.

Offensive Screens Meowstic

Meowstic (M) @ Light Clay
Ability: Prankster
EVs: 248 HP / 252 SpA / 8 Spe
Modest Nature
IVs: 0 Atk
- Thunder Wave
- Light Screen
- Reflect
- Psychic

This Meowstic forgoes Yawn in favor of Psychic, so that it is not completely disabled once it has been Taunted by your opponent.
With Psychic, Meowstic maximizes its Special Attack stat via a Modest nature and 252 EVs in SpAtk.
This Meowstic can run 8 Spe EVs in order to outspeed other Meowstics at 246 Speed total, and everything else that's slower.
Like the one above, this Meowstic also uses an Attack IV of 0 to minimize Confusion and Foul Play damage.

SubCM Meowstic

Meowstic @ Leftovers
Ability: Prankster
EVs: 96 HP / 172 SpA / 240 Spe
Timid Nature
IVs: 0 Atk

240 Speed with a Timid nature beats positive nature 252 Spe base base 101s (i.e. Simipour, Simisage, and Simisear at 331 Speed), and everything slower.
Its HP investment allows Meowstic to avoid having its Substitute broken by uninvested Stunfisk at +1 (thanks to Calm Mind).
The remainder of its EVs are placed in Special Attack to make Meowstic as threatening as possible after having powered up via Calm Mind.
Its Attack IV should be 0 in order to minimize Foul Play and confusion damage.
Standard Quilladin

Quilladin @ Eviolite
Ability: Bulletproof
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature

Standard Quilladin uses maximum investment in HP and Defense in conjunction with Eviolite to wall as many offensive threats as possible, while setting up Spikes.
Even though 252 EVs in HP yields an even number overall, it does not matter too much because Quilladin is able to heal off any extra damage incurred via Synthesis.
Its remaining 4 EVs are placed in Attack.

Offensive Spiker Quilladin

Quilladin @ Eviolite
Ability: Bulletproof
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

Hitting 213 speed total is perfect, as it allows Quilladin to outspeed and Taunt most notable leads like Jolly 252 Spe Whirlipede (212), 96 Spe Roselia (190), neutral nature 252 Spe base 45s (e.g. Marowak and Golem at 189 Speed), and everything below. It can also keep up its Spikes by Taunting Pelipper before it Defogs, which can prove to be very beneficial.

Jolly Taunt Quilladin

Quilladin @ Focus Sash
Ability: Bulletproof
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

Jolly 252 Spe Quilladin hits 234 speed; the main benefit of using Jolly over Adamant is being able to outspeed and Taunt Jolly 252 Spe Dwebble (229) before it sets up a layer of hazards.
Running max speed with Taunt also prevents Jolly / Timid 252 Spe Huntail (223) from using Shell Smash, and it can OHKO Jolly 252 Spe Relicanth (229) before it moves. Endeavor with a Focus Sash also sets this Quilladin apart from the others and is a viable option.
Wallbreaker Rampardos

Rampardos @ Life Orb
Ability: Sheer Force
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature / Naughty Nature

Naive 252 Spe Rampardos hits 236 Speed, allowing it to Speed tie with Jolly 252 Spe Zweilous, while outspeeding everything slower.
While Naive is often preferred for its ability to outspeed everything between 235 and 216 Speed (e.g. most notably Jolly 252 Spe Carbink (218), Jolly 252 Spe Dwebble (229), and all of the aforementioned threats above), a Naughty nature can still be ran to improve Rampardos' capabilities as a wallbreaker.
Finally, there is little need to give Rampardos an HP stat ending in 9, as Sheer Force already prevents recoil from Life Orb on most of its moves.

Suicide Lead Rampardos

Rampardos @ Focus Sash
Ability: Mold Breaker
EVs: 128 Atk / 128 SpA / 252 Spe
Naive Nature

Like the previous set, maximum Speed investment is needed, as this set lets Rampardos Speed tie with Jolly Zweilous, while outspeeding everything slower.
Its 128 EVs in SpA allow Rampardos to OHKO Golem and Dwebble with Surf because Mold Breaker bypasses Sturdy.
Its remaining 128 EVs should be placed in Attack in order to let it hit as hard as possible with its physical attacks.

128 SpA Mold Breaker Rampardos Surf vs. 0 HP / 4 SpD Golem: 308-364 (102.3 - 120.9%) -- guaranteed OHKO
128 SpA Mold Breaker
Rampardos Surf vs. 0 HP / 0 SpD Dwebble: 242-286 (100.4 - 118.6%) -- guaranteed OHKO
Standard Servine

Servine @ Eviolite
Ability: Contrary
EVs: 16 HP / 252 SpA / 240 Spe
Timid Nature

Timid 240 Spe Servine with Hidden Power Ice hits 288 Speed total and outspeeds Timid / Jolly 252 Spe Monferno (287), Jolly 252 Spe Arbok (284), and everything below. Rather than running Modest, Leaf Storm with Contrary already gives Servine the boost in Special Attack it needs to hit hard, so running a Timid nature with enough Speed for Monferno is necessary here.
Its remaining EVs are placed in HP to give it slightly more bulk. At the same time, these 16 EVs in HP yield an odd number of HP overall, which minimizes indirect forms of damage such as Stealth Rock.
Another option is to run Choice Scarf over Eviolite here with the appropriate moveset. Using a Choice Scarf lets 288 Spe Servine hit 432 after a Scarf, and outspeed everything between 289-431 Speed, which is quite a long list of Pokemon (see http://www.smogon.com/forums/threads/pu-speed-tiers.3523350/ for more details on what Choice Scarf Servine outspeeds).
Sun Sweeper Weepinbell

Weepinbell @ Life Orb / Eviolite
Ability: Chlorophyll
EVs: 4 Def / 252 SpA / 252 Spe
Modest / Timid Nature
IVs: 29 HP if using Life Orb

When Sunny Day is active, Modest 252 Spe Weepinbell hits 418 Speed, which outspeeds the entire unboosted meta, save for Adamant/Naughty 252 Spe Ninjask (419). However, Weepinbell has the option of running Timid in order to outspeed other boosted threats at a total of 458 Speed, such as +1 Timid 252 Spe Rotom-Frost (447). Timid Weepinbell in the Sun just misses outspeeding Choice Scarf Mr. Mime by 1 point, making the choice between Timid and Modest a toss-up, and often times, a contextually based decision depending on team composition.
Weepinbell should use the rest of its EVs to maximize its Special Attack in order to hit as hard as possible, and consequently, to make the most out of Sunny Day's seemingly short duration. Weepinbell can further augment its Special Attack stat either with Growth (and therefore, Eviolite to allow it to setup Growth), or a Life Orb. If Weepinbell uses a Life Orb, it should reduce its HP stat to a number ending in 9 accordingly, so that it can more optimally reduce Life Orb recoil.
Its remaining EVs are placed in one of its Defensive stats to avoid giving Weepinbell an even number of HP.

C Rank

Special Attacker Drifblim

Drifblim @ Chesto Berry / Petaya Berry
Ability: Unburden
EVs: 8 HP / 32 Def / 252 SpA / 40 SpD / 176 Spe with Rest and a Chesto Berry
*Alternative Spread
: 12 HP / 32 Def / 252 SpA / 36 SpD / 176 Spe with Substitute and a Petaya Berry
Modest Nature

Drifblim should use 176 EVs in Speed to hit 240 Speed total, which outspeeds neutral nature 252 Spe invested base 70s (i.e. Lunatone, Luxray, Mightyena) by 1 point.
After Drifblim has used its Chesto Berry and Unburden has activated, Modest Drifblim with 176 Spe EVs hits 480 Speed total, which outspeeds Scarf Sawsbuck (475), Scarf Mime (459), and everything below.

When EVing Drifblim, your second priority should be to totally maximize whichever attacking stat you plan on using; in this case, 252 EVs are used to increase Drifblim's Special Attack.

Its final 80 EVs are split up in order to optimize its bulk.

If Drifblim is using a Pinch Berry (Petaya, for example) combined with Substitute, an even number of HP (i.e. the second spread with 12 HP) lets Drifblim activate its Pinch berry after 3 Substitutes instead of 4.
However, if Special Attacking Drifblim is using Rest with Calm Mind and a Chesto Berry instead, then the first spread should be used to maintain an odd number of HP so that it can minimize passive forms of damage.

AcroBlim

Drifblim @ Sitrus Berry / Liechi Berry
Ability: Unburden
EVs: 12 HP / 252 Atk / 32 Def / 36 SpD / 176 Spe
*Alternative Spread: 12 HP / 244 Atk / 40 SpD / 212 Spe
Adamant Nature

The same spread is used as above, with the EVs in Special Attack transferred to Attack instead.
This Drifblim also runs Substitute with a Pinch berry, so 12 HP EVs let it reach +1 Attack after 3 Substitutes instead of 4.
However, if you do not plan on using a Liechi Berry, Drifblim should use 8 HP / 252 Atk / 32 Def / 40 SpD / 176 Spe. This spread without a Pinch berry hits an odd number of HP, which is better for switching into Stealth Rock.
Its alternative spread is used for outspeeding everything up to and including +1 Timid or Jolly 252 Spe Simisear, Simisage, and Simisear.
Offensive Pivot Furfrou

Furfrou @ Leftovers
Ability: Fur Coat
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature

Offensive Pivot Furfrou utilizes its position in a superior Speed tier to spread Paralysis and pivot on the majority of the meta with U-turn, therefore it should maximize its Speed stat via full EV investment and a Jolly nature. Jolly 252 Spe Furfrou hits 333 Speed total, and outspeeds positive nature 252 Spe Simisage, Simisear, Simipour (331), Jolly 252 Spe Dodrio / Timid 252 Spe Ninetales (328), and everything below.
After its Speed has been maximized, 252 EVs should be placed in Attack in order to provide Furfrou with a powerful STAB, as well as priority in Sucker Punch to beat faster, yet frailer attackers such as Kadabra.
Its remaining 4 EVs should be placed in Special Defense, as its Defense is already boosted by Fur Coat and it already has an odd number of HP without EV investment, which is ideal for reducing various forms of passive damage.

Status Platform Furfrou

Furfrou @ Leftovers
Ability: Fur Coat
EVs: 248 HP / 8 SpD / 252 Spe
Jolly Nature

Furfrou can run a more defensive spread by shifting its Attack EVs into HP. This lets Furfrou make better use of its ability, Fur Coat, by surviving many more physical hits than it would have otherwise. 248 EVs in HP yields 353 HP overall, which is both an odd number for reducing various forms of passive damage and a Leftovers number for slightly enhanced HP regeneration.
Fully invested Speed also allows Furfou to spread both Thunder Wave and Toxic to the maximum number of targets, thus giving it answers to both offensive threats and defensive threats, respectively.
Its remaining 8 EVs are placed in Special Defense in order to increase its mixed bulk. However, these 8 EVs can be placed in Attack just as easily to increase both Frustration's and U-turn's damage.
Specially Defensive Hypno

Hypno @ Leftovers
Ability: Insomnia
EVs: 248 HP / 8 Def / 252 SpD
Calm Nature
IVs: 0 Atk

Uninvested Hypno hits 170 Speed, which is enough to outspeed uninvested Pelipper and Roselia (166), and everything below.
In order to take special attacks more effectively, Hypno should be given a Calm Nature with 252 EVs placed in Special Defense. Its HP stat should also be maximized, while hitting an odd number of HP to reduce passive damage taken.
Its remaining EVs are placed in Defense in order to help it better sponge physical attacks.
Finally, Hypno is given an Attack IV of 0, so that it takes less damage from Foul Play.
Choice Band Luxray

Luxray @ Choice Band
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

Maximum investment in Attack and Speed allows Luxray to hit as hard and be as fast as possible. Its remaining EVs are placed in Defense to minimize indirect forms of damage by giving it an odd number of HP overall, while giving Luxray slightly more physical bulk in conjunction with its ability, Intimidate.
A Jolly nature lets Luxray hits 262 Speed, which Speed ties Jolly 252 Spe Solrock (262) and outspeeds neutral nature 252 Spe base 80s (i.e. Drifblim, Stoutland, Arbok at 259 Speed), Jolly 252 Spe Fraxure (256), and everything below.
However, a Jolly nature is not preferred, because it is often not worth the drop in attack power.
Standard Regigigas

Regigigas @ Leftovers
Ability: Slow Start
EVs: 248 HP / 252 Atk / 8 Def
Adamant Nature

In general, Regigigas' EVs should be used to maximize its bulk, so that it is more likely Slow Start will wear off during a battle, allowing Regigigas to take full advantage of its base 160 Attack Stat.
For this reason, both Attack and HP should be maximized, without yielding an even number of HP overall. Therefore, Regigigas uses 248 EVs in HP, and 252 EVs in Attack with an Adamant nature.
Its remaining EVs should be placed in the one of its Defense stats, for the same reason its HP is maximized.
Slightly more Speed (i.e. 16 Speed EVs) can be used to outspeed neutral nature 252 Spe base 70s once its Slow Start has worn off, such as Mightyena, Luxray, and Lunatone. Similarly, 72 EVs let it outspeed neutral nature uninvested base 45s before Slow Start has deactivated, such as Machoke.

C- Rank

Standard Lickilicky

Lickilicky @ Leftovers
Ability: Oblivious
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature

While running 252 HP is an option for maximizing Wish passes to its teammates, Lickilicky should still run 248 HP to minimize passive forms of damage, as running an even number by using 252 HP EVs here does not yield a Leftovers number (i.e. 424 HP total is not divisible by 16).
It is recommended to keep Lickilicky above 70% HP throughout the match in order to be able to continuously check Ninetales with its Body Slam, therefore minimizing passive damage done to Lickilicky to preserve it for potent special threats is recommended.

+2 252 SpA Life Orb Ninetales Fire Blast vs. 248 HP / 252+ SpD Lickilicky: 253-300 (59.8 - 70.9%) -- guaranteed 2HKO after Leftovers recovery

Its remaining 8 EVs can be placed in Speed to avoid speed-ties with other uninvested base 50s, or in Defense.

Offensive Lickilicky

Lickilicky @ Lum Berry / Leftovers / Choice Band
Ability: Oblivious
EVs: 216 HP / 252 Atk / 40 Spe
*Alternative Spread: 120 HP / 252 Atk / 136 Spe
Adamant Nature

Lickilicky should maximize Attack first, hit its desired Speed second, and place the remaining EVs into HP without giving Lickilicky an even number of HP third.
The Speed that Lickilicky should hit is variable, but should never exceed 190 speed total (as this would detract too much from its overall bulk).
It can run anywhere from 8 Speed to outspeed fellow neutral nature uninvested base 50s, such as Regice and Audino, or it can run as high as 212 Speed in order to hit 190 Speed total, in order to outspeed neutral nature 252 Spe invested base 45s, such as Armado, Golem and Marowak.
However, the best spread for outspeeding common walls is 136 Spe EVs or 170 Speed total. This allows Lickilicky to outspeed neutral nature 8 Spe invested base 65s, such as Roselia while maintaining an odd number of HP.
40 Speed is an alternative spread and maximizes Lickilicky's bulk, while allowing Lickilicky to outspeed uninvested Gourgeist-Super (145) by 1 point. In conjunction with a Lum Berry, this lets +2 Lickilicky defeat Gourgeist-Super with Knock Off, while avoiding the 2HKO from Gourgeist's Foul Play.

With +2, Lickilicky has a chance to OHKO many walls:

+2 252 Atk Lickilicky Knock Off (97.5 BP) vs. 248 HP / 252+ Def Gourgeist-Super: 200-236 (53.6 - 63.2%) -- guaranteed 2HKO after Leftovers recovery
+2 252+ Atk Lickilicky Knock Off (97.5 BP) vs. 248 HP / 244 Def Eviolite Misdreavus: 252-298 (78 - 92.2%) -- 31.3% chance to OHKO after Stealth Rock
+2 252+ Atk Lickilicky Return vs. 248 HP / 128 Def Eviolite Roselia: 273-322 (90 - 106.2%) -- 43.8% chance to OHKO
+2 252+ Atk Lickilicky Return vs. 248 HP / 8 Def Grumpig: 384-453 (105.7 - 124.7%) -- guaranteed OHKO
Crobink

Carbink @ Leftovers
Ability: Clear Body
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature

252 HP invested Carbink reaches a stat of 304 total, which is divisible by 16 and is therefore a Leftovers number. While Carbink may take more damage with an even number of HP from sources like Hail, Leech Seed, Burn, etc., the HP recovery via Rest and Leftovers make up for this fact.
Given Carbink runs Calm Mind on this set, the rest of its EVs are used to maximize its Defense in order to tank resisted physical hits better from threats like Flareon and Dodrio.
Carbink does not need to invest in Speed, but as an option, it can run its last 4 EVs in Speed to outspeed other uninvested base 50s, like Lickilicky.

Sun Support Carbink

Carbink @ Heat Rock
Ability: Sturdy
EVs: 248 HP / 8 Atk / 252 Spe
Jolly Nature

Sturdy Carbink uses maximized HP in order to even out its overall bulk, so that it can setup both Stealth Rock and Sun, if possible. Carbink can still run 252 HP, as it will rarely face passive forms of damage like Stealth Rock as a Lead (similarly, it can also bounce back Leech Seed, Toxic and Will-O-Wisp via Magic Coat).
With a Jolly nature and 252 EVs in Speed, Carbink hits 218 Speed total and outspeeds uninvested Vigoroth (216), neutral nature 252 Spe base 58s (i.e. Rampardos and Zweilous at 215 Speed), Jolly 252 Spe Whirlipede (212), and everything below.
Its remaining EVs are placed in Attack in order to produce a slightly stronger Explosion after it has setup both Sunny Day and Stealth Rock.

Trick Room Support Carbink

Carbink @ Mental Herb / Normal Gem / Custap Berry
Ability: Sturdy
EVs: 248 HP / 8 Atk / 252 Def
Relaxed Nature
IVs: 0 Spe

Like Sun Support Carbink, maximum HP investment allows Carbink to setup both Stealth Rock and Trick Room reliably at the beginning of a match. Unlike the previous set however, this set invests fully in Defense to better handle physical attackers.
Given this set is used as a lead for Trick Room teams, 252 HP can be used instead to provide slightly more bulk.
A Relaxed nature with a Speed IV of 0 allows Carbink to "outspeed" foes after Trick Room has been used. Its remaining EVs are placed in Attack to provide a stronger Explosion after setting up both Stealth Rock and Trick Room.
Imposter Ditto

Ditto @ Choice Scarf
Ability: Imposter
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature

Ditto's HP stat should be maximized, as HP is the only stat that transfers over upon Imposter activation. Investing 248 EVs in HP lets Ditto hit a Stealth Rock number, which means Ditto will be hurt slightly less by some forms of passive damage.
Maximum investment in Defense decreases the damage that Ditto may take from another Ditto (if the match up is Ditto vs another Ditto).
A Relaxed nature and lowered Speed IVs are used to obtain the lowest Speed for the possible, albeit rare, Struggle war mentioned previously.

Ditto's IVs can be manipulated to yield different types of Hidden Powers post transformation. For example, Hidden Power Ground can be used to hit Raichu and Zebstrika supereffectively after Imposter has activated (assuming these threats are using Hidden Power to begin with).

30 Def / 30 SpD / 1 Spe = HP Rock
30 Def / 30 SpA / 1 Spe = HP Grass
0 Atk / 30 Def / 1 Spe = HP Ice
30 SpA / 30 SpD / 1 Spe = HP Ground
30 Atk / 30 SpA / 0 Spe = HP Fire
30 SpA / 1 Spe = HP Electric
Etc.
Standard Munchlax

Munchlax @ Eviolite
Ability: Thick Fat
EVs: 248 HP / 8 Def / 252 SpD
Careful Nature

Given its high HP and Special Defense stats, access to Thick Fat, and its ability to use Eviolite, Munchlax is perfectly poised to act as a specially defensive tank to take on various special attackers in PU, which rely on their Fire and Ice STABs, such as Ninetales and Vanilluxe.
Due to the fact that Curse already raises Munchlax's Defense and Attack, Munchlax does not need to fully invest in Defense; instead, Munchlax should have both its HP and Special Defense stats fully maximized without using an even number of HP.
Its remaining 8 EVs should be placed in either Defense or Attack, in order to bolster the effects of Curse.
Simple Sweeper Swoobat

Swoobat @ Salac Berry / Kee Berry
Ability: Simple
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature

Timid 252 Spe Swoobat hits 359 total, which outspeeds Jolly 252 Spe Purugly (355), positive nature 252 Spe base 110s (i.e. Raichu, Jumpluff at 350 Speed), and everything below.
However, after its Salac Berry has activated and it effectively gains +2 Speed via its ability, Simple, it hits 718 Speed total, which is the fastest Pokemon in the entire PU metagame, just barring things like Choice Scarf Dittos that Transform into +2 Swoobat, or Ninjask with multiple Speed boosts.
If using a Kee Berry, this gives Swoobat +2 Defense upon being struck by any physical attack, which increases its walling capabilities greatly (for example, Piloswine's Ice Shard does less than 50% to a +2 Defense Swoobat):

252+ Atk Piloswine Ice Shard vs. +2 0 HP / 4 Def Swoobat: 98-116 (35.6 - 42.1%) -- guaranteed 3HKO

Its remaining 4 EVs are placed in Defense in order to yield an odd number of HP overall, so that Swoobat can reduce the damage it takes when switching into Stealth Rock.
 
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D Rank

Suicide Lead Dwebble

Dwebble @ Custap Berry
Ability: Sturdy
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature

Jolly 252 Spe Dwebble hits 229 Speed total, and outspeeds Jolly 252 Spe Huntail (223), Jolly 252 Spe Carbink (218), and everything below.
After it has maximized its Speed stat, it invests 252 EVs into Attack in order to allow it to kill certain defoggers that switch in after Dwebble has begun to lay both Spikes and Stealth Rock:

252 Atk Dwebble Rock Blast (4 hits) vs. 248 HP / 252+ Def Pelipper: 152-192 (47 - 59.4%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
252 Atk Dwebble Rock Blast (3 hits) vs. 0 HP / 0 Def Swanna: 234-276 (80.4 - 94.8%) -- guaranteed OHKO after Stealth Rock

Suicide lead Dwebble also has a good matchup with Misdreavus, who may attempt to Taunt Dwebble before it stacks hazards. Its Knock Off is able to 2HKO offensive variants of Misdreavus:

252 Atk Dwebble Knock Off (97.5 BP) vs. 0 HP / 4 Def Eviolite Misdreavus: 136-162 (52.1 - 62%) -- guaranteed 2HKO

Dwebble's last 4 EVs are placed in Defense in order to yield an odd number of HP overall, should Dwebble need to be used later in the battle.
Standard Flareon

Flareon @ Choice Band / Charcoal
Ability: Flash Fire
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature

After maximum investment in Attack, 252 EVs in Speed should be ran as this allows Flareon to speed-tie with neutral nature 252 Spe base 65s, like Rash 252 Spe Seviper. It also speed-ties with positive nature 252 Spe base 55s, like Jolly 252 Spe Relicanth and Jolly 252 Spe Ursaring, while outspeeding Jolly 252 Spe Huntail (223), and everything below.
Flareon should be given an odd number of HP overall by placing its last 4 EVs in Defense, so that it can minimize damage taken from switching into Stealth Rock.
Wallbreaker Heatmor

Heatmor @ Life Orb
Ability: Flash Fire
EVs: 56 Atk / 252 SpA / 200 Spe
Rash Nature
IVs: 29 HP

With a Life Orb and 56 EVs in Atk, Heatmor is able to 2HKO specially defensive Lickilicky with Low Kick, after damage from Stealth Rock has been taken into account. Superpower can be used to hit Ninetales harder, but for the sake of 2HKOing Lickilicky, Low Kick is better. Given the drop in Attack, Heatmor has a chance to sometimes miss the 2HKO on Lickilicky with Superpower. Focus Blast with full Special Attack investment and a Life Orb also 2HKOs Lickilicky, but given wallbreaker Heatmor is fairly slow, it would be preferrable to run Sucker Punch with some EVs in Attack instead of a full special attacking set.

56 Atk Life Orb Heatmor Low Kick (100 BP) vs. 252 HP / 0 Def Lickilicky: 203-239 (47.8 - 56.3%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
252+ SpA Life Orb Heatmor Focus Blast vs. 252 HP / 252+ SpD Lickilicky: 239-283 (56.3 - 66.7%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

After maximizing Special Attack and running 56 Atk EVs for Lickilicky, the rest of Heatmor's EVs should be placed in Speed. Using 200 Speed EVs allows Heatmor to reach 216 Speed, which is enough to outpace neutral nature 252 Spe base 58s, like Rampardos and Zweilous.
Heatmor can run an HP IV of 29 in order to reduce its HP stat to 309 overall, which is better for reducing recoil from Life Orb. At the same time, this odd number of HP is optimal as it also reduces damage taken from Stealth Rock.
Rock Polish Lunatone

Lunatone @ Life Orb
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature
IVs: 29 HP

After a Rock Polish, Modest 252 Spe invested Lunatone hits 478 Speed total, and outspeeds Choice Scarf Sawsbuck (475), Choice Scarf Mr. Mime (459), and everything below.
Modest Nature, 252 SpA EVs, and a Life Orb are used to improve Lunatone's sweeping potential, while its remaining 4 EVs are placed in Defense in order to avoid an even number of HP overall.
Lunatone should be given an HP stat ending in 9 (i.e. 279 total with an HP IV of 29), because the best way to reduce Life Orb recoil is an HP stat that is one under a stat divisible by 10, meaning the last digit would be 9.
Nasty Plot Persian

Persian @ Life Orb
Ability: Technician
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 29 HP

252 EVs in Special Attack, a possible boost via Nasty Plot, and a Life Orb all allow Persian to hit as hard as possible.
Maximum investment in Speed along with a Timid nature allows Persian to speed-tie with opposing Jolly / Timid 252 Spe Floatzel and Persian (361), while outspeeding everything below that, such as Timid 252 Spe Swoobat (359).
Its remaining 4 EVs are placed in Defense to take slightly less damage from priority attacks, while maintaining an odd number of HP to minimize entry hazard damage.
An HP IV of 29 is used here to optimally reduce Life Orb recoil by giving Persian an HP stat ending in 9.
Wallbreaker Seviper

Seviper @ Life Orb
Ability: Shed Skin
EVs: 8 HP / 248 SpA / 252 Spe
Rash Nature

Rash 252 Spe Seviper hits 229 Speed, and outspeeds Jolly 252 Spe Huntail (223), Jolly 252 Spe Carbink (218), and everything below. Rash 252 Spe Seviper also Speed ties all neutral nature 252 Spe base 65s (i.e. Flareon and Heatmor), as well as positive nature 252 Spe base 55s (i.e. Dwebble, Relicanth and Ursaring).
The next priority in terms of EVing Seviper should be to give it an HP stat ending in 9 in order to optimally reduce Life Orb Recoil.
This can be done by placing 8 EVs in HP, which means the rest of its EVs should be used to maximize its Special Attack.

Choice Scarf Seviper

Seviper @ Choice Scarf
Ability: Infiltrator
EVs: 4 Def / 252 SpA / 252 Spe
Modest Nature / Timid Nature

Modest 252 Spe Seviper with a Choice Scarf hits 343 Speed total, which is enough to Speed tie +1 Jolly 252 Spe Ursaring and outspeed everything below.
However, a Timid nature can also be ran here to allow +1 Timid 252 Spe Seviper to hit 376 Speed overall and get the surprise OHKO on Jumpluff after Stealth Rock:

252 SpA Seviper Sludge Wave vs. 0 HP / 4 SpD Jumpluff: 270-320 (92.7 - 109.9%) -- guaranteed OHKO after Stealth Rock
Physically Defensive Torkoal

Torkoal @ Leftovers
Ability: Shell Armor
EVs: 248 HP / 252 Def / 8 SpD
Relaxed Nature

Torkoal with max Defense is able to find many opportunities to spin away Stealth Rock or setup Rocks of your own by being able to switch into most physical threats in PU.
Torkoal runs a Relaxed Nature here for the sake of using Earthquake together with Lava Plume against specially defensive Fire type Pokemon such as Flareon and Ninetales who would otherwise have a free switch-in on Torkoal:

0 Atk Torkoal Earthquake vs. 248 HP / 8 Def Flareon: 188-222 (56.4 - 66.6%) -- guaranteed 2HKO after Leftovers recovery
0 Atk Torkoal Earthquake vs. 0 HP / 0 Def Flareon: 190-224 (70.1 - 82.6%) -- guaranteed 2HKO
0 Atk Torkoal Earthquake vs. 8 HP / 0 Def Ninetales: 160-190 (55.3 - 65.7%) -- guaranteed 2HKO

248 HP EVs are ran to provide Torkoal with the chance to switch into Stealth Rock one more time via an odd number of HP overall, while the remaining 8 EVs are placed in Special Defense.

Shell Smash Torkoal

Torkoal @ White Herb / Life Orb
Ability: Shell Armor
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature

Shell Smash with Fire Blast allows Torkoal to nail Spinblockers in PU for a great deal of damage; it even gives Torkoal a chance to OHKO Misdreavus with Fire Blast after Stealth Rock damage. Because of this Torkoal's ability to deal with spinblockers, it has many opportunities to use Rapid Spin to remove any entry hazards from its side.

+2 252 SpA Torkoal Fire Blast vs. 0 HP / 0 SpD Eviolite Misdreavus: 205-243 (78.5 - 93.1%) -- 37.5% chance to OHKO after Stealth Rock

The given EVs and nature allow Torkoal to OHKO Eviolite Roselia and to 2HKO Lickilicky after a Shell Smash and Stealth Rock damage. The final move of the set depends on what threat you want to cover. Hidden Power Grass allows Torkoal to OHKO Relicanth, while Earth Power allows Torkoal to deal with Probopass, Heatmor, Flareon, Ninetales and Rapidash.

+2 252 SpA Torkoal Fire Blast vs. 248 HP / 252+ SpD Eviolite Roselia: 300-354 (99 - 116.8%) -- guaranteed OHKO after Stealth Rock
+2
252 SpA Torkoal Fire Blast vs. 248 HP / 252+ SpD Lickilicky: 201-237 (47.5 - 56%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

A Timid nature is preferred here as it allows Torkoal to outspeed positive nature 252 Spe base 86 Speed Pokemon and everything below after a Shell Smash, which includes Adamant 252 Spe Linoone (299), Timid 252 Spe Rotom-F without a Choice Scarf (298), and most importantly, positive nature 252 Spe Misdreavus (295 or 294 with Hidden Power Fighting).
However, a Modest nature with a Life Orb can still be used with this set as it offers more power to Torkoal overall, and still outspeeds everything below 278 speed at +2 Speed.

E Rank and Unranked

Suicide Lead Kricketune

Kricketune @ Focus Sash
Ability: Swarm / Technician
EVs: 252 Atk / 252 Spe
Jolly Nature

As Kricketune is best used as a suicide lead, maximum Speed investment along with a Jolly Nature allows Kricketune to hit 251 Speed total and outspeed other leads such as Naive 252 Spe Rampardos (236), Jolly 252 Spe Dwebble (229), and Jolly 252 Spe Carbink (218).
The rest of its EVs are used to maximize its Attack, so that its Knock Off can hit as hard as possible.
Kricketune does not use its last 4 EVs, as this extra bulk is more or less useless and detracts slightly from Kricketune's ability to use Endeavor with as little HP as possible.
Standard Frogadier

Frogadier @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe with Naive
*Alternative Spread: 4 Def / 252 SpA / 252 Spe with Timid
Naive Nature / Timid Nature

Naive 252 Spe Frogadier reaches 322 Speed total, and outspeeds +1 Jolly 252 Spe Whirlipede (318), positive nature 252 Spe base 95s like Leafeon and Sawsbuck (317), and everything below.
After 322 Speed has been reached, Frogadier should invest fully in Special Attack to take advantage of the power that Protean and Life Orb offer.
Depending on its nature and set, its last 4 EVs are placed in either Defense or Attack. A Naive nature and 4 EVs in Attack are used when Frogadier is using Low Kick or U-Turn. However, if Frogadier is not using a physical move, then a Timid nature with 4 EVs in Defense should be used instead.
Without any changes, Frogadier's HP stat is perfect (249 total), as it already reduces Life Orb recoil optimally. This odd number of HP also reduces passive forms of damage like Stealth Rock, Leech Seed, Poison, etc.

Choice Scarf Frogadier

Frogadier @ Choice Scarf
Ability: Protean
EVs: 36 Atk / 252 SpA / 220 Spe
Rash Nature

Scarf Frogadier provides the power to break faster Wallbreakers, like NP Raichu, along with utility moves like Toxic Spikes and U-Turn all in the same set. If a defogger / Poison type doesn't exist on the other team, it can easily lay layers of Toxic Spikes, given Grass attacks will be ineffective once Toxic Spikes activates Frogadier's Protean. Outside of this utility, Rash Scarf Frogadier hits hard with a max SpAtk / STAB / positive nature Hydro Pump. With its Speed already being increased via a Choice Scarf, Frogadier should run maximum Special Attack with a Rash nature.
Using a Rash nature means that Frogadier will lose 10% Special Defense instead of 10% of its Attack, which maximizes the damage it does with Low Kick / U-Turn / Gunk Shot. Low Kick can be used to hit +2 252 Modest Regice (398) super effectively, given you outspeed at 427 Speed total. But, if you choose Grass Knot over U-turn or other physical coverage, you can place the remaining EVs in Defense.
220 Speed EVs before a Choice Scarf hits 285 Speed total, so a Choice Scarf is enough to let you outspeed +1 252 Spe Jolly Stoutland (426) by 1 point.
Suicide Spiker Whirlipede

Whirlipede @ Focus Sash
Ability: Speed Boost
EVs: 244 HP / 12 Def / 252 Spe
Jolly Nature

Whirlipede's first priority should be to maximize its Speed Stat. Before any Speed boosts, Jolly 252 Spe Whirlipede hits 212 Speed total and outspeeds Adamant 252 Spe Relicanth and Ursaring (209), and everything below.
After 2 Speed boosts, Whirlipede hits 318 Speed, which is enough to outspeed positive nature 252 Spe base 95s like Leafeon and Sawsbuck by 1 point.
Finally, after 3 Speed boosts, Whirlipede hits a whopping Speed stat of 530 with these same EVs, which is enough to outspeed +1 Timid 252 Spe Raichu by 5 points.
244 HP with 12 Def optimizes its physical bulk. This also yields an even number of HP overall, but this doesn't matter as much given Whirlipede will rarely have to switch back into battle anyway.
Whirlipede should be used over Venipede if your team needs something to switch into Roselia, Lickilicky, Tangela, Gourgeist-Super, or Carbink in order to setup its entry hazards.
 
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