Larvesta @ Eviolite
Ability: Flame Body
EVs: 248 HP / 112 Def / 148 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- Flamethrower
- Bug Buzz
- Morning Sun
The Volcarona family has a unique typing, so this is the best I could muster. Better defenses in exchange for no Z-move and a worse recovery move.
Dedenne @ Petaya Berry
Ability: Cheek Pouch
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Dazzling Gleam
- Hidden Power [Ice]
- Recycle
Dedenne gets the two things it was robbed of: good stats and Fairy STAB.
Snorlax @ Figy Berry
Ability: Gluttony
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Belly Drum
- Extreme Speed
- Crunch
- Earthquake / Substitute / Recycle
Normal-types in general sound terrifying, as they don't need an item to ascend to Arceus levels, complete with STAB Extreme Speed.
Medicham @ Mewtwonite X
Ability: Pure Power
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- High Jump Kick
- Zen Headbutt
- Ice Punch
- Stone Edge
Pure Power + base 190 attack.
Mawile @ Mawilite
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Shift Gear
- Play Rough
- Knock Off
- Ice Punch
How does Mega Evolution work? Could Mawile get Magearna's bulk and access to Shift Gear, boost up a few times, then Mega Evolve and swap its stats to those of Mega Mawile?
Slurpuff @ Power Herb
Ability: Unburden
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Geomancy
- Dazzling Gleam
- Flamethrower
- Thunderbolt
If this isn't already the case, if the highest BST mon requires an item, you should be able to ascend to the second (or third, or whatever it may be) highest by not holding the required item. In this case, because it's not holding the Pixie Plate required to ascend to Arceus-Fairy, Slurpuff ascends to the highest available option, being Xerneas. Keep in mind that giving every pure Fairy-type access to Geomancy isn't as broken as it sounds, as none of them reach the raw power of Xerneas, thanks to Fairy Aura and some Fairies not getting access to Moonblast. And since this is an Ubers-based metagame, Xerneas is legal, so you'd need a good reason to use a non-Xerneas Fairy over Xerneas. In the case of Slurpuff, it gets a huge Speed boost from both Geomancy and Unburden, and it has Fire coverage.
Crawdaunt @ Choice Band
Ability: Adaptability
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Crabhammer
- Aqua Jet / Spikes
- Knock Off / Spikes
- Crunch / Spikes
Non-Gyaradosite Crawdaunt inherits Ash Greninja's amazing speed and power. A Specs set is also an option, but Crawdaunt has to chose between inheriting Hydro Pump and Spikes.
Gumshoos @ Choice Band
Ability: Adaptability
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Extreme Speed
- Earthquake
- Crunch
- U-turn
Eevee @ Eevium Z
Ability: Adaptability
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Last Resort
- Return
- Earthquake
- Refresh
Eevee @ Eevium Z
Ability: Adaptability
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
- Last Resort
- Hyper Voice
- Shadow Ball
- Fire Blast
Adaptability combined with Arceus.
I also thought it would be cool to see what sets the unbanned Kantofication mons could use.
Zygarde
Ability: Aura Break
- Earthquake
- Rock Slide
- Glare
- Bind
SlideQuake is tried and true coverage. Glare, while not as reliable as Thunder Wave, is serviceable. The same can be said for Bind in relation to Wrap.
Shaymin-Sky
Ability: Serene Grace
- Swords Dance
- Headbutt
- Hyper Beam
- Solar Beam
Oh boy, this is a bad one. Swords Dance is nice, its Attack is passable, and it's still got good Speed (and thus a high crit chance), but that's where the positives ends. Its movepool is absolutely horrendous, and its only STAB move is Solar Beam, forcing it to predict an incoming Rock-type on the switch, and then "slam" a Grass resist as the Rock-type switches out.
Pheromosa
Ability: Beast Boost
- High Jump Kick
- Blizzard
- Hyper Beam
- Leer
Pheromosa starts out strong. It's got a great crit chance and good special bulk. High Jump Kick is the best Fighting-type attack in Gen 1. Blizzard is one of the best moves in Gen 1 and pairs nicely with High Jump Kick. Unfortunately, Pheromosa's potent movepool runs dry once you get to the last slot, with its best option being Leer to soften incoming opponents.
Naganadel
Ability: Beast Boost
IVs: 0 Atk
- Fire Blast
- Thunderbolt
- Growl
- Hyper Beam
Like Pheromosa, Naganadel starts out strong with Fire Blast and Thunderbolt, but those and Flamethrower are the only good moves it gets. Growl weakens the opponent, and Hyper Beam is only okay going off of Naganadel's middling Attack stat.
Marshadow
Ability: Technician
- Jump Kick
- Rock Slide
- Thunder Punch
- Ice Punch
Marshadow is probably the most viable of the unbanned mons, or at least the most well-rounded. Jump Kick is a pretty good move, and Rock Slide complements it well. BoltBeam coverage is never a bad thing, and Marshadow's Special is decent. Being a Ghost is also nice, as it grants immunity to Hyper Beam.
Aegislash
Ability: Stance Change
- Rock Slide
- Swords Dance
- Slash
- Hyper Beam
Another stinker. Great bulk, but no support moves to abuse it, forcing it to make due with offensive sets running off a base 50 Attack stat. Rock Slide, Swords Dance, and Hyper Beam are nice. Slash is also nice, but doesn't mesh well with Swords Dance.