Groudon @ Red Orb  
Ability: Electric Surge  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Will-O-Wisp  
- Strength Sap  
- Stealth Rock  

Zygarde-Complete @ Rocky Helmet  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Precipice Blades  
- U-turn  
- Roost  
- Defog  

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

Mewtwo-Mega-Y @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psystrike  
- Taunt  
- Magma Storm  
- Moonblast  

Blissey (F) @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Whirlwind  
- Final Gambit  
- Trick  
- Roost  

Yveltal @ Black Glasses  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Haze  
- Recover  
- Perish Song  
- Revelation Dance