Eternatus @ Dragon Fang  
Ability: Dragon's Maw  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Dragon Energy  
- Sludge Bomb  
- Final Gambit  
- Soft-Boiled  

Xerneas @ Pixie Plate  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Rash Nature  
- Boomburst  
- Rapid Spin  
- Diamond Storm  
- Strength Sap  

Heatran @ Assault Vest  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Spectral Thief  
- Knock Off  
- Nuzzle  
- U-turn  

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

Zamazenta-Crowned @ Lum Berry  
Ability: Fur Coat  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Anchor Shot  
- Thunderous Kick  
- Aromatherapy  
- Roost  

Palkia @ Lustrous Orb  
Ability: Adaptability  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- Fishious Rend  
- Dragon Energy  
- Volt Switch  
- Strength Sap