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  
- Knock Off  
- Nuzzle  

Giratina @ Griseous Orb  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Teleport  
- Spectral Thief  
- Roost  
- Worry Seed  

Regigigas @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Shift Gear  
- Facade  
- V-create  
- Spikes  

Eternatus @ Black Sludge  
Ability: Lightning Rod  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Electrify  
- Sludge Bomb  
- Earth Power  
- Core Enforcer  

Ho-Oh @ Heavy-Duty Boots  
Ability: Desolate Land  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Stealth Rock  
- V-create  
- Shore Up  
- Glare  

Magearna-Original @ Shuca Berry  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Topsy-Turvy  
- Rapid Spin  
- Soft-Boiled  
- Glare