Giratina @ Griseous Orb  
Ability: Mummy  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Teleport  
- Spectral Thief  
- Core Enforcer  
- Soft-Boiled  

Zamazenta-Crowned @ Rocky Helmet  
Ability: Mummy  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Anchor Shot  
- Spectral Thief  
- Nuzzle  
- Milk Drink  

Groudon @ Soft Sand  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Parting Shot  
- Haze  
- Thousand Arrows  
- Shore Up  

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

Eternatus @ Black Sludge  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Core Enforcer  
- Sludge Bomb  
- Spikes  
- Volt Switch  

Magearna @ Heavy-Duty Boots  
Ability: Pixilate  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
- Boomburst  
- Rapid Spin  
- Volt Switch  
- Strength Sap