Latios-Mega (M) @ Soul Dew  
Ability: Protean  
EVs: 52 HP / 252 SpA / 204 Spe  
Modest Nature  
IVs: 0 Atk  
- Grass Knot  
- Secret Sword  
- Flash Cannon  
- Moonblast  

Ho-Oh @ Toxic Orb  
Ability: Magic Guard  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
IVs: 30 Spe  
- Psycho Shift  
- Flare Blitz  
- Defog  
- Recover  

Groudon-Primal @ Choice Band  
Ability: Mold Breaker  
EVs: 232 HP / 252 Atk / 12 SpD / 12 Spe  
Adamant Nature  
- V-create  
- Thousand Arrows  
- Aqua Jet  
- U-turn  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 8 Def / 252 SpA  
Quiet Nature  
IVs: 0 Atk / 0 Spe  
- Magic Coat  
- Substitute  
- Moonblast  
- Baton Pass  

Giratina @ Griseous Orb  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Encore  
- Curse  
- Roost  

Kyogre-Primal @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Recover  
- Scald  
- Defog  
- Aromatherapy