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

Xerneas @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Quiver Dance  
- Moonblast  
- Strength Sap  
- Thunder Cage  

Ho-Oh @ Charcoal  
Ability: Desolate Land  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Roost  
- Spikes  
- Nuzzle  

Zamazenta-Crowned @ Fighting Memory  
Ability: Tough Claws  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Wicked Blow  
- Multi-Attack  
- Swords Dance  
- Sunsteel Strike  

Groudon @ Leftovers  
Ability: Fur Coat  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
- Thousand Waves  
- Core Enforcer  
- Shore Up  
- Knock Off  

Yveltal @ Heavy-Duty Boots  
Ability: Aerilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Strength Sap  
- Volt Switch  
- Boomburst  
- Rapid Spin