Zygarde-Complete @ Assault Vest  
Ability: Regenerator  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- U-turn  
- Core Enforcer  
- Nuzzle  
- Rapid Spin  

Chansey (F) @ Eviolite  
Ability: Imposter  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Anchor Shot  
- Soft-Boiled  
- Haze  
- Topsy-Turvy  

Blissey (F) @ Toxic Orb  
Ability: Imposter  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Fling  
- Soft-Boiled  
- Heal Bell  
- Parting Shot  

Xerneas @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
- Moonblast  
- Lava Plume  
- Rapid Spin  
- Quiver Dance  

Aegislash @ Leftovers  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Encore  
- U-turn  
- Shore Up  
- Destiny Bond  

Mewtwo-Mega-Y @ Life Orb  
Ability: Magic Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Mind Blown  
- Light of Ruin  
- Moongeist Beam  
- Psystrike