Team

Regigigas @ Toxic Orb
Ability: Poison Heal
EVs: 252 Atk / 252 Spe
Adamant Nature
- Bullet Punch
- Facade
- Moongeist Beam
- Sunsteel Strike

Gengar-Mega @ Spooky Plate
Ability: Normalize
EVs: 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Entrainment
- Judgment
- Quiver Dance
- Secret Sword

Mewtwo-Mega-Y @ White Herb
Ability: Unburden
Shiny: Yes
EVs: 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Shell Smash
- Imprison
- Stored Power
- Aura Sphere

Groudon-Primal @ Leftovers
Ability: Contrary
EVs: 4 HP / 252 Atk / 252 Def
Adamant Nature
- V-create
- Superpower
- Fusion Bolt
- Thousand Arrows

Greninja-Ash @ Life Orb
Ability: Lightning Rod
Shiny: Yes
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Electrify
- Steam Eruption
- Dark Pulse
- Flame Burst

Chansey @ Eviolite
Ability: Imposter
Shiny: Yes
EVs: 252 HP
Serious Nature
IVs: 0 Atk
- Skill Swap