Kanto

Chansey @ Eviolite
Ability: Natural Cure
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
- Toxic
- Counter
- Soft-Boiled
- Seismic Toss

Gengar @ Choice Specs
Ability: Cursed Body
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sludge Wave
- Shadow Ball
- Thunderbolt
- Focus Blast

Clefable @ Leftovers
Ability: Unaware
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Moonlight
- Moonblast
- Fire Blast
- Calm Mind

Charizard-Mega-X @ Charizardite X
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Dragon Dance
- Outrage
- Flare Blitz
- Roost

Magneton @ Eviolite
Ability: Sturdy
EVs: 248 HP / 252 Def / 8 SpA
Bold Nature
IVs: 0 Atk
- Flash Cannon
- Protect
- Thunderbolt
- Toxic

Mew @ Leftovers
Ability: Synchronize
EVs: 252 HP / 128 Def / 4 SpA / 124 SpD
Calm Nature
IVs: 0 Atk
- Toxic
- Fire Blast
- Roost
- Protect