Nihilego @ Black Sludge  
Ability: Sand Stream  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Revelation Dance  
- Shore Up  
- Baneful Bunker  
- Clear Smog  

Tyranitar-Mega @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Knock Off  
- Beak Blast  
- Spectral Thief  
- Defog  

Gengar-Mega @ Choice Specs  
Ability: Adaptability  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moongeist Beam  
- Sludge Bomb  
- Volt Switch  
- Secret Sword  

Mewtwo-Mega-X @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Knock Off  
- Low Kick  
- Spiky Shield  
- U-turn  

Arceus @ Safety Goggles  
Ability: Unaware  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Spectral Thief  
- Recover  
- Boomburst  
- Anchor Shot  

Yveltal @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Haze  
- Topsy-Turvy  
- Shore Up  
- Revelation Dance