Project Victim of the Week

[Aragorn the King]

Week 64:

Charizard @ Charizardite X
Ability: Blaze -> Tough Claws
EVs: 56 HP / 252 Atk / 4 Def / 196 Spe
Adamant Nature
- Swords Dance
- Flare Blitz
- Dragon Claw / Outrage / Earthquake
- Roost / Earthquake

Good luck ;)

 

[p2]

Garchomp as a check

Garchomp @ Choice Scarf
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Outrage
- Dragon Claw
- Earthquake
- Stone Edge

Garchomp switches in on anything that isn't Outrage / Dragon Claw and OHKOs with Earthquake, though it struggles to come in on +2 ZardX as Flare Blitz actually has a chance to OHKO after Rocks. Scarf isn't even necessary since this Charizard can't boost Speed.

252 Atk Garchomp Earthquake vs. 56 HP / 4 Def Mega Charizard X: 300-354 (96.4 - 113.8%) -- 75% chance to OHKO
252 Atk Garchomp Outrage vs. 56 HP / 4 Def Mega Charizard X: 356-422 (114.4 - 135.6%) -- guaranteed OHKO

+2 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 4 Def Garchomp: 297-351 (83.1 - 98.3%) -- 31.3% chance to OHKO after Stealth Rock
+2 252+ Atk Mega Charizard X Earthquake vs. 0 HP / 4 Def Garchomp: 249-293 (69.7 - 82%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 4 Def Garchomp: 149-176 (41.7 - 49.2%) -- 21.5% chance to 2HKO after Stealth Rock
252+ Atk Mega Charizard X Earthquake vs. 0 HP / 4 Def Garchomp: 124-147 (34.7 - 41.1%) -- guaranteed 3HKO after Stealth Roc

 

[bludz]

Rhyperior - Check / Hard Check

Rhyperior @ Leftovers
Ability: Solid Rock
EVs: 212 HP / 44 Atk / 252 Def
Adamant Nature
- Stealth Rock
- Earthquake
- Stone Edge
- Ice Punch

Rhyperior counters Zard X without Outrage since +2 Dragon Claw fails to OHKO and Earthquake / Stone Edge usually KOs in return. Stone Edge KOs cheeky Zards that try to SD twice without Mega Evolving to dodge an Earthquake. Zard X carrying Outrage can actually KO Rhyperior at +2 after Stealth Rocks about 2/3s of the time (although less if Rhyperior switches into the SD and gets some leftovers recovery).

calcs

+2 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 212 HP / 252 Def Rhyperior: 189-222 (44.5 - 52.3%) -- 21.5% chance to 2HKO after Stealth Rock and Leftovers recovery

+2 252+ Atk Mega Charizard X Earthquake vs. 212 HP / 252 Def Solid Rock Rhyperior: 237-279 (55.8 - 65.8%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

+2 252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 212 HP / 252 Def Rhyperior: 250-295 (58.9 - 69.5%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery

+2 252+ Atk Tough Claws Mega Charizard X Outrage vs. 212 HP / 252 Def Rhyperior: 378-445 (89.1 - 104.9%) -- 31.3% chance to OHKO

+2 252+ Atk Tough Claws Mega Charizard X Outrage vs. 212 HP / 252 Def Rhyperior: 378-445 (89.1 - 104.9%) -- 68.8% chance to OHKO after Stealth Rock

44+ Atk Rhyperior Earthquake vs. 56 HP / 4 Def Mega Charizard X: 300-354 (96.4 - 113.8%) -- 75% chance to OHKO

44+ Atk Rhyperior Stone Edge vs. 56 HP / 4 Def Mega Charizard X: 300-354 (96.4 - 113.8%) -- 75% chance to OHKO

I'm only providing calcs of Zard at +2 just because without the SD they all do pitiful damage (calc it yourself, even Outrage only has an 24% chance to 2HKO after Rocks + Lefties), meaning that Zard doesn't really have the luxury of wearing down Rhyperior on repeated switch-ins because it will take entry damage from rocks each time as well.

EDIT: If you want to be a scrub and run max/max defense with an Impish nature then Charizard X will always fail to OHKO with +2 Outrage after Stealth Rocks but EQ / Stone Edge becomes only a 25% chance to OHKO in return, so the 44 Atk Adamant spread makes the most sense anyway. There are middle grounds that you can customize just to beat Zard (212 HP / 44 Atk / 252 Def Impish only 12.5% to be OHKO'd after Rocks and 50% to OHKO Zard) but honestly this is just playing around with rolls anyway

 

[Lil YoshiXD]

Check/Counter

Quagsire @ Leftovers
Ability: Unaware
EVs: 252 HP / 252 Def / 4 SpD
Relaxed Nature
- Scald
- Earthquake
- Recover
- Toxic

Standard quag. Pretty simple if it carries outrage you lose otherwise you win because you ignore the SD boosts and Dragon claw doesn't do enough
252+ Atk Tough Claws Mega Charizard X Outrage vs. 252 HP / 252+ Def Quagsire: 229-271 (58.1 - 68.7%) -- guaranteed 2HKO after Leftovers recovery

252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 252 HP / 252+ Def Quagsire: 153-180 (38.8 - 45.6%) -- guaranteed 3HKO after Leftovers recovery

Lot of damage but you can tank it.
in return:

0 Atk Quagsire Earthquake vs. 56 HP / 4 Def Mega Charizard X: 170-204 (54.6 - 65.5%) -- guaranteed 2HKO
or just toxic it.

Sadly SD set usually does have outrage.

BTW are we seriously supposed to have 3 counters to this thing? Much easier to just revenge it since lack of speed

 

[escarlata]

Check
Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock / Thunderbolt
- Healing Wish / Roost
- Defog

Latias cannot switch into dragon STAB, but otherwise she pretty much switches in comfortably on anything else. By virtue of SD zard being unable boost its speed, Draco Meteor pretty much gets rid of zard right there and then.

252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 72 HP / 0 Def Latias: 156-185 (48.9 - 57.9%) -- 96.9% chance to 2HKO

On a fundamental level, Latios can basically do exactly what Latias is capable of doing. The difference is that Latios dies after 2 switches into SR after life orb recoil, while Latias is able to survive it. That and healing wish ofc.

Hide

Ok I basically gave up trying to find a counter for that set. Everytime I thought I found a counter, I add another move that zard can use into the equation, and it falls apart. Everything faster is either OHKOed by flare blit or outrage; or if they can tank both aforesaid moves, simply cannot ensure the OHKO in return due to that 56 HP EV. Defensive mons might be able to avoid the 2HKO, but still would lose if zard used on the switch outrage or swords dance. Either that, or they simply cannot chip enough damage to outdo roost. At a fundamental level, it seems that Rhyperior above, is perhaps the closest thing we have to a counter to zard, and even that is a shaky one relying on damage rolls.

 

[Aragorn the King]

BTW are we seriously supposed to have 3 counters to this thing? Much easier to just revenge it since lack of speed

Yeah I may just do 6 checks for this one :P

 

[Random Passerby]

Name: Mega Diancie
Status: Check

Diancie @ Diancite
Ability: Clear Body
EVs: 80 Atk / 252 SpA / 176 Spe
Naive Nature
- Moonblast
- Diamond Storm
- Earth Power
- Rock Polish

Diancie can come in on Outrage, Swords Dance or Roost and can survive even a Flare Blitz (although this is not recommended). Then, it outspeeds and OHKOes Mega Charizard-X with Diamond Storm. Beware that Earthquake OHKOes Diancie .

176 Spe with Naive allows Diancie to outspeed positive nature base 100s. The rest of the EVs are used in Attack and Special Attack to hit harder.

Calculations

252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 0 Def Mega Diancie: 132-156 (54.7 - 64.7%) -- guaranteed 2HKO
52+ Atk Mega Charizard X Earthquake vs. 0 HP / 0 Def Mega Diancie: 222-262 (92.1 - 108.7%) -- 50% chance to OHKO
80 Atk Mega Diancie Diamond Storm vs. 56 HP / 4 Def Mega Charizard X: 312-368 (100.3 - 118.3%) -- guaranteed OHKO

 

[GnralLao]

Tyrantrum as a Check

Tyrantrum @ Choice Scarf
Ability: Rock Head
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Head Smash
- Outrage
- Earthquake
- Superpower

Due to its unique Dragon/Rock-typing, Tyrantrum can easily tank a Flare Blitz (even at +2!) and can also switch into MegaZard-X's SD or Roost. In return, Tyrantrum outspeeds and OHKOes it with its STAB move of choice. Beware that Earthquake deals great damage to Tyrantrum and that Dragon Claw (and Outrage) OHKOes it.

Calcs

252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 4 Def Tyrantrum: 61-72 (20 - 23.6%) -- 52.8% chance to 4HKO after Stealth Rock
+2 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 4 Def Tyrantrum: 123-145 (40.3 - 47.5%) -- 53.1% chance to 2HKO after Stealth Rock
252+ Atk Mega Charizard X Earthquake vs. 0 HP / 4 Def Tyrantrum: 206-244 (67.5 - 80%) -- guaranteed 2HKO
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 0 HP / 4 Def Tyrantrum: 326-386 (106.8 - 126.5%) -- guaranteed OHKO (don't switch into that!)

252 Atk Tyrantrum Outrage vs. 56 HP / 4 Def Mega Charizard X: 338-402 (108.6 - 129.2%) -- guaranteed OHKO
252 Atk Tyrantrum Head Smash vs. 56 HP / 4 Def Mega Charizard X: 422-500 (135.6 - 160.7%) -- guaranteed OHKO

 

[heritage]

nothing idk
Check

Latios @ Life Orb
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Hidden Power Fire
- Defog

Similarly to Latias, Latios can't switch in very comfortably, as it really fears Dragon Claw, but since Charizard has no way of boosting its Speed stat, Latios can safely revenge kill it with Draco Meteor, even if Charizard is at +2 Attack. If you're really desperate, you can attempt to switch into a Flare Blitz, as Latios lives one, a Roost or a Swords Dance, although it's not the smartest option considering Dragon Claw or Outrage easily OHKOs Latios, even without Stealth Rock, due to its mediocre defense.

What Latios does

252 SpA Life Orb Latios Draco Meteor vs. 56 HP / 0 SpD Mega Charizard X: 634-749 (203.8 - 240.8%) -- guaranteed OHKO

What Charizard does

252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 0 Def Latios: 173-204 (57.8 - 68.2%) -- guaranteed 2HKO
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 0 HP / 0 Def Latios: 458-540 (153.1 - 180.6%) -- guaranteed OHKO

 

[InvisibleWater]

Check

Heatran @ Choice Scarf
EVs: 28 HP / 252 SpA / 228 Spe
Timid Nature
- Overheat
- Flash Cannon
- Earth Power
- Stone Edge / Ancient Power

Heatran can switch into any of Charizard's moves (except Earthquake or +2 Outrage), and, with a Scarf, outspeed and 2HKO with Earth Power.

However, if rocks aren't up and Charizard hasn't been damaged, it gets an opportunity to retaliate, set up, or switch to a Ground resist.

Calcs

Offensive:
252 SpA Heatran Overheat vs. 56 HP / 0 SpD Mega Charizard X: 61-72 (19.6 - 23.1%) -- possible 5HKO
252 SpA Heatran Flash Cannon vs. 56 HP / 0 SpD Mega Charizard X: 75-89 (24.1 - 28.6%) -- 98% chance to 4HKO
252 SpA Heatran Earth Power vs. 56 HP / 0 SpD Mega Charizard X: 226-266 (72.6 - 85.5%) -- guaranteed 2HKO
0- Atk Heatran Stone Edge vs. 56 HP / 4 Def Mega Charizard X: 108-128 (34.7 - 41.1%) -- guaranteed 3HKO
252 SpA Heatran Ancient Power vs. 56 HP / 0 SpD Mega Charizard X: 150-178 (48.2 - 57.2%) -- 91% chance to 2HKO

Defensive:
252+ Atk Tough Claws Mega Charizard X Outrage vs. 28 HP / 0 Def Heatran: 136-161 (41.2 - 48.7%) -- guaranteed 3HKO
+2 252+ Atk Tough Claws Mega Charizard X Outrage vs. 28 HP / 0 Def Heatran: 273-321 (82.7 - 97.2%) -- guaranteed 2HKO
+4 252+ Atk Tough Claws Mega Charizard X Outrage vs. 28 HP / 0 Def Heatran: 408-481 (123.6 - 145.7%) -- guaranteed OHKO
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 28 HP / 0 Def Heatran: 90-107 (27.2 - 32.4%) -- guaranteed 4HKO
+2 252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 28 HP / 0 Def Heatran: 180-213 (54.5 - 64.5%) -- guaranteed 2HKO
+4 252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 28 HP / 0 Def Heatran: 271-319 (82.1 - 96.6%) -- guaranteed 2HKO
252+ Atk Mega Charizard X Earthquake vs. 28 HP / 0 Def Heatran: 456-540 (138.1 - 163.6%) -- guaranteed OHKO

 

[Albacore]

Check

Slowbro @ Slowbronite
EVs: 252 HP / 80 Def / 176 SpD
- Scald
- Slack Off
- Iron Defense
- Calm Mind

Ugh not even MBro counters this thing... But it does check, since it swicthes into anything besides Swords Dance, and can start stacking up Iron Defenses in the knowledge that it can't get critted and will win the boosting war. If XZard attacks it falls behind, and if it doesn't, Slowbro is healthy enough to keep boosting as opposed to Recover. In the end, you get this:

+6 252+ Atk Tough Claws Mega Charizard X Outrage vs. +6 252 HP / 80+ Def Mega Slowbro: 148-175 (37.5 - 44.4%) -- 2% chance to 2HKO after Stealth Rock

If you really want to you can run Max Phys Def on it to take +2 Dragon Claw more comfortably:

+2 252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 252 HP / 252+ Def Mega Slowbro: 178-211 (45.1 - 53.5%) -- guaranteed 2HKO after Stealth Rock

but that's a silly and desperate thing to do.

 

[Level 56]

Mega-Aerodactyl (Check)

Aerodactyl-Mega @ Aerodactylite
Ability: Tough Claws
EVs: 212 Atk / 44 Def / 252 Spe
Adamant Nature
- Stone Edge
- Earthquake
- Ice Fang
- Aerial Ace

Mega-Aero can't switch-in safely against Charizard-X as it is OHKO'ed by Outrage, though it can survive a Dragon claw. Since Charizard-X doesn't have Dragon dance, Mega-Aero can easily revenge kill it with Stone Edge.

 

[Fredrick1]

I don't think there's a perfect counter to this monster.

TERRAKION AS A CHECK

Terrakion @ Life Orb
Ability: Justified
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Stone Edge
- Swords Dance
- Substitute

Terrakion switches in to Flare Blitz, but thats only it. In return, knocks Charizard X out with a Life Orb boosted Stone Edge.
252 Atk Life Orb Terrakion Stone Edge vs. 56 HP / 4 Def Mega Charizard X: 385-455 (123.7 - 146.3%) -- guaranteed OHKO

 

[-Ixtamacunxi-]

Check

Hydreigon @ Life Orb
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Draco Meteor
- Dark Pulse
- Flash Cannon
- Superpower / Earth Power

Similar to the Lati twins, Hydreigon can't switch in safely because it is OHKO'd by Dragon Claw or Outrage, but it outspeeds this Char X spread and can revenge kill it with Draco Meteor. Alternatively, it can run Earth Power to KO Charizard-X without having to fear a Draco miss.

252+ SpA Life Orb Hydreigon Draco Meteor vs. 56 HP / 0 SpD Mega Charizard X: 678-798 (218 - 256.5%) -- guaranteed OHKO
252+ SpA Life Orb Hydreigon Earth Power vs. 56 HP / 0 SpD Mega Charizard X: 312-369 (100.3 - 118.6%) -- guaranteed OHKO

 

[DarkNostalgia]

Kyurem-Black @ Life Orb
Ability: Teravolt
EVs: 4 Atk / 252 SpA / 252 Spe
Mild Nature
- Ice Beam
- Earth Power
- Fusion Bolt
- Roost / Outrage

As Swords Dance Mega Charizard X lacks a way of boosting its Speed stat, even slower Pokemon such as Kyurem-B can check them effectively. Kyurem-B is only check however as Dragon Claw / Outrage OHKOes, and even an unboosted Flare Blitz does upward 90%. In return, Kyurem-B OHKOes with Earth Power (87.5%), or if running Outrage, then Outrage OHKOes. Standard spread but going maximum Speed is better imo for opposing Kyurem-B and also conveniently outpaces Swords Dance Mega Charizard X.

252+ SpA Life Orb Teravolt Kyurem-B Earth Power vs. 56 HP / 0 SpD Mega Charizard X: 304-359 (97.7 - 115.4%) -- 87.5% chance to OHKO
4 Atk Life Orb Teravolt Kyurem-B Outrage vs. 56 HP / 4 Def Mega Charizard X: 486-577 (156.2 - 185.5%) -- guaranteed OHKO
252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 0- Def Kyurem-B: 319-376 (81.5 - 96.1%) -- guaranteed 2HKO
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 0 HP / 0- Def Kyurem-B: 422-500 (107.9 - 127.8%) -- guaranteed OHKO

 

[DoABarrelRoll]

(soft check)
Dugtrio @ Focus Sash
Ability: Arena Trap
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Earthquake
- Sucker Punch
- Stone Edge / Memento
- Reversal / Stealth Rock

dugtrio is able to switch into swords dance or roost and punish x-zard with EQ for the 2HKO.

252 Atk Dugtrio Earthquake vs. 0 HP / 4 Def Mega Charizard X: 218-258 (73.4 - 86.8%) -- guaranteed 2HKO

 

[Qwanda]

Check

Tyranitar @ Choice Scarf
Ability: Sand Stream
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Stone Edge
- Pursuit
- Superpower
- Crunch

ScarfTar switches in on the predicted SD, but takes anything so long as Zard is not set up. It then proceeds to kill with stone edge. Basically, switch its bulky enough so that you don't have to predict Zard coming in, so you simply switch in as they go for whatever move, then kill. You can even like a +2 Flare Blitz if you happen to let it set up, but don't count on that as TTar dies to a boosted dragon claw.
You could also run a physically defensive spread to turn this into a soft counter, but that set is pretty unviable and as such your better off to stick to this.

+2 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 0 HP / 4 Def Tyranitar: 263-310 (77.1 - 90.9%) -- guaranteed 2HKO

252+ Atk Mega Charizard X Earthquake vs. 0 HP / 4 Def Tyranitar: 220-260 (64.5 - 76.2%) -- guaranteed 2HKO
(Zards most powerful move against TTar)

 

[powergo1]

Bulky Mega Altaria as a Check

Altaria @ Altarianite
Ability: Pixilate
EVs: 248 HP / 252 Def / 8 SpD OR 248 HP / 8 Def / 252 SpD
Bold Nature
- Cotton Guard
- Hyper Voice
- Roost
- Toxic/Roar

When you're up against a Charizard-X that has a SD already up, there's not much that can 'wall' it, you can only really check it due to it's (lack of) speed. Hence, I thought of Cotton Guard M-Alt as a way to wall it, if you get a free switch-in due to one of your pokemon fainting or outrage, or predict an Earthquake as normal Altaria. Then, you can use Cotton Guard to boost your defenses to 875 (350*2.5), and wall it out using Roost and Hyper Voice/Toxic, or alternatively use Roar to force Charizard-X out, causing it to lose its boosts. The EV spread is as standard, 248 HP to get an odd number. The choice between having full Def or SpDef investment doesn't really matter unless Charizard has Iron Tail, but it is so rare it doesn't really matter, so the choice is yours. (For the calcs, I will be using the 248 HP/252Def/8SDef spread.)

Calculations:

Hide

With no boosts at all:
252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 248 HP / 252+ Def Mega Altaria: 97-114 (27.4 - 32.2%) -- guaranteed 4HKO

252+ Atk Mega Charizard X Earthquake vs. 248 HP / 252+ Def Mega Altaria: 81-96 (22.9 - 27.1%) -- 56.2% chance to 4HKO

With one SD for Zard:

+2 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. 248 HP / 252+ Def Mega Altaria: 193-228 (54.6 - 64.5%) -- guaranteed 2HKO

+2 252+ Atk Mega Charizard X Earthquake vs. 248 HP / 252+ Def Mega Altaria: 162-191 (45.8 - 54.1%) -- 50% chance to 2HKO

After M-Alt has used Cotton Guard once:

+2 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. +3 248 HP / 252+ Def Mega Altaria: 78-92 (22 - 26%) -- 5.3% chance to 4HKO

+2 252+ Atk Mega Charizard X Earthquake vs. +3 248 HP / 252+ Def Mega Altaria: 65-77 (18.4 - 21.8%) -- possible 5HKO

0 SpA Pixilate Mega Altaria Hyper Voice vs. 56 HP / 0 SpD Mega Charizard X: 157-186 (50.4 - 59.8%) -- guaranteed 2HKO (Don't quote me on this, but I believe that due to Flare Blitz's recoil Hyper Voice has a chance to OHKO. The change is better if using the SDef set)

Even at +4, Zard-X cannot 2HKO

+4 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. +3 248 HP / 252+ Def Mega Altaria: 116-137 (32.8 - 38.8%) -- 99.5% chance to 3HKO

And at +6, the chance is still low:

+6 252+ Atk Tough Claws Mega Charizard X Flare Blitz vs. +3 248 HP / 252+ Def Mega Altaria: 155-183 (43.9 - 51.8%) -- 10.9% chance to 2HKO

TL;DR , get a switch in with MAlt or predict Outrage (if already Mega) or Earthquake (if normal), proceed to boost defense and heal, use roar or kill it with your VOICE!

 

[Aragorn the King]

Week 65:

Manaphy @ Wacan Berry / Lum Berry
Ability: Hydration
EVs: 96 HP / 252 SpA / 160 Spe
Modest / Timid Nature
- Tail Glow
- Surf / Scald
- Ice Beam
- Energy Ball / Psychic / Hidden Power Fire

Remember, something can be a counter and lose to a move that is slashed; it will just (likely) lose out to a mon that handles all of the moves slashed.

 

[boltsandbombers]

Tangrowth as a Check

Tangrowth @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 8 Atk / 252 SpD
Sassy Nature
- Hidden Power [Fire]
- Knock Off
- Leaf Storm
- Earthquake

Despite needing max Special Defense, a boosting nature, and an Assault Vest to check Manaphy, it does it pretty well. Tangrowth can stomach even boosted hit from Manaphy and almost OHKO in return with Leaf Storm. It can also pivot into Scalds from Manaphy early game, since it normally waits a bit to set up.

calcs

Worst case scenario:
+3 252+ SpA Manaphy Ice Beam vs. 252 HP / 252+ SpD Assault Vest Tangrowth: 324-382 (80.1 - 94.5%) -- 50% chance to OHKO after Stealth Rock
Slightly better:
+3 252 SpA Manaphy Ice Beam vs. 252 HP / 252+ SpD Assault Vest Tangrowth: 294-348 (72.7 - 86.1%) -- guaranteed 2HKO after Stealth Rock
Almost dead :P [you could invest 52 spa evs to always OHKO after rocks but w/e]
0 SpA Tangrowth Leaf Storm vs. 96 HP / 0 SpD Manaphy: 302-356 (82.7 - 97.5%) -- 68.8% chance to OHKO after Stealth Rock

 

[heritage]

Hard Check

Disappear (Raikou) @ Assault Vest
EVs: 252 SpA / 32 SpD / 224 Spe
Timid Nature
- Thunderbolt
- Volt Switch
- Hidden Power Ice
- Shadow Ball

Raikou can come in repetitively on Manaphy's attacks, especially if it has Surf over Scald since there's no risk of Burning, and 2HKOs Wacan Berry versions back, since the Berry only activates once, and even having a chance to OHKO Lum Berry after Stealth Rock damage. Since Raikou outspeeds Manaphy, if it uses Tail Glow on the switch, the best it can do is around 72%-79% at +3. However, Raikou has no reliable recovery and burn from a potential Scald can wear it down pretty easily.

What Manaphy does

+3 252 SpA Manaphy Surf vs. 0 HP / 32 SpD Assault Vest Raikou: 198-234 (61.6 - 72.8%) -- guaranteed 2HKO

+3 252+ SpA Manaphy Surf vs. 0 HP / 32 SpD Assault Vest Raikou: 217-256 (67.6 - 79.7%) -- guaranteed 2HKO

What Raikou does back

252 SpA Raikou Thunderbolt vs. 96 HP / 0 SpD Wacan Berry Manaphy: 135-160 (36.9 - 43.8%) -- guaranteed 3HKO
252 SpA Raikou Thunderbolt vs. 96 HP / 0 SpD Manaphy: 270-320 (73.9 - 87.6%) -- guaranteed 2HKO

 

[Dr Ciel]

Reserving Mega Venusaur.

Mega Venusaur as a Check

Venusaur @ Venusaurite
Ability: Chlorophyll
EVs: 248 HP / 96 Def / 144 SpD / 20 Spe
Bold Nature
- Giga Drain
- Sludge Bomb
- Synthesis
- Hidden Power Fire

Mega Venusaur can switch in on everything but Psychic variants of TG Manaphy, and after a Tail Glow, can survive one hit from Ice Beam, and regain enough health for Ice Beam to never 2HKO barring critical hits.

Relevant Damage Calculations

+3 252 SpA Manaphy Surf vs. 248 HP / 144 SpD Mega Venusaur: 116-137 (31.9 - 37.7%) -- 92.7% chance to 3HKO

+3 252 SpA Manaphy Ice Beam vs. 248 HP / 144 SpD Thick Fat Mega Venusaur: 156-184 (42.9 - 50.6%) -- 2.3% chance to 2HKO

+3 252 SpA Manaphy Ice Beam vs. 248 HP / 144 SpD Thick Fat Mega Venusaur: 156-184 (42.9 - 50.6%) -- 96.9% chance to 2HKO after Stealth Rock

+3 252 SpA Manaphy Energy Ball vs. 248 HP / 144 SpD Mega Venusaur: 38-45 (10.4 - 12.3%) -- possible 8HKO after Stealth Rock

0 SpA Mega Venusaur Giga Drain vs. 80 HP / 0 SpD Manaphy: 192-228 (53.1 - 63.1%) -- guaranteed 2HKO after Leftovers recovery

 

[bludz]

Check

Kyurem-Black @ Life Orb
Ability: Teravolt
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Ice Beam
- Fusion Bolt
- Earth Power
- Roost

Kyurem-Black with max speed outspeeds Manaphy making it a reliable revenge killer, and can switch into any move very reliably except for Scald. +3 coverage moves fail to OHKO even after Stealth Rocks and Fusion Bolt has a high chance to OHKO Manaphy after Rocks. Roost allows Kyu-B to stay healthy and more reliably check Manaphy. More attack can be run to achieve a better roll but because Kyurem-Black outspeeds anyway it's not really necessary

calculations

+3 252 SpA Manaphy Ice Beam vs. 0 HP / 0 SpD Kyurem-B: 223-263 (57 - 67.2%) -- guaranteed 2HKO after Stealth Rock
+3 252 SpA Manaphy Psychic vs. 0 HP / 0 SpD Kyurem-B: 223-263 (57 - 67.2%) -- guaranteed 2HKO after Stealth Rock
+3 252 SpA Manaphy Energy Ball vs. 0 HP / 0 SpD Kyurem-B: 111-131 (28.3 - 33.5%) -- guaranteed 3HKO after Stealth Rock
+3 252 SpA Manaphy Surf vs. 0 HP / 0 SpD Kyurem-B: 167-197 (42.7 - 50.3%) -- guaranteed 2HKO after Stealth Rock
+3 252 SpA Manaphy Hidden Power Fire vs. 0 HP / 0 SpD Kyurem-B: 149-176 (38.1 - 45%) -- guaranteed 2HKO after Stealth Rock

4 Atk Life Orb Teravolt Kyurem-B Fusion Bolt vs. 96 HP / 0 Def Manaphy: 299-354 (81.9 - 96.9%) -- 62.5% chance to OHKO after Stealth Rock
4 Atk Life Orb Teravolt burned Kyurem-B Fusion Bolt vs. 96 HP / 0 Def Manaphy: 149-177 (40.8 - 48.4%) -- 10.5% chance to 2HKO after Stealth Rock and Leftovers recovery

 

[Clone]

Aragorn the King wouldn't 'Tail Glow + 3 attacks Manaphy' make a bit more sense as a title? Idk just seems like the current one is a bit... Wonky

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Latias @ Life Orb
Ability: Levitate
EVs: 72 HP / 184 SAtk / 252 Spe
Timid Nature
- Draco Meteor
- Psychic
- Roost
- Defog

While not the greatest answer to Manaphy, this is often all offense usually has to formally 'check' it after a boost. Her brother works as well, but the basic premise is that a Draco will take Manaphy out after a bit of prior damage, and since you're faster, you usually don't trade unless you're at less than 10% HP.

Early game, Latias is able to switch into unboosted scalds and even ice beams if she is healthy enough, and force Manaphy out to (hopefully) take sr damage after a few switch ins.

 

[MrAldo]

Reserving serperior

Serperior as a Check

Serperior @ Life Orb / Miracle Seed
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 29 HP / 0 Atk / 30 SpA / 30 Spe
- Hidden Power [Fire]
- Giga Drain / Glare
- Dragon Pulse
- Leaf Storm

Can switch into every attack except for ice beam, tanks ice beam like a champ and proceed to kill with leaf storm. Miracle seed still have a solid chance of OHKOing manaphy without the added recoil but it isnt guaranteed. Easy

252 SpA Life Orb Serperior Leaf Storm vs. 96 HP / 0 SpD Manaphy: 385-455 (105.4 - 124.6%) -- guaranteed OHKO

252 SpA Miracle Seed Serperior Leaf Storm vs. 96 HP / 0 SpD Manaphy: 356-420 (97.5 - 115%) -- 81.3% chance to OHKO