Xerneas @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Moonblast  
- Rapid Spin  
- Strength Sap  
- Knock Off  

Dialga @ Leftovers  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Sassy Nature  
- Core Enforcer  
- Soft-Boiled  
- Anchor Shot  
- Spectral Thief  

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

Groudon @ Leftovers  
Ability: Ice Scales  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Thousand Waves  
- Knock Off  
- Purify  
- Roost  

Celesteela @ Rocky Helmet  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Anchor Shot  
- Haze  
- Taunt  
- Slack Off  

Yveltal @ Sharp Beak  
Ability: Triage  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Nasty Plot  
- Oblivion Wing  
- Thunder Cage  
- Taunt