Regigigas @ Toxic Orb  
Ability: Poison Heal  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Facade  
- Spore  
- Dragon Dance  
- Thousand Waves  

Calyrex-Shadow @ Choice Scarf  
Ability: Mold Breaker  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Astral Barrage  
- Trick  
- Volt Switch  
- Psystrike  

Chansey (F) @ Eviolite  
Ability: Imposter  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Stealth Rock  
- Wish  
- U-turn  
- Final Gambit  

Yveltal @ Heavy-Duty Boots  
Ability: Prankster  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Haze  
- Knock Off  
- Roost  
- Destiny Bond  

Xerneas @ Toxic Orb  
Ability: Poison Heal  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Quiver Dance  
- Moonblast  
- Spiky Shield  
- Thunder Cage  

Magearna @ Assault Vest  
Ability: Regenerator  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- U-turn  
- Spectral Thief  
- Moonblast  
- Rapid Spin