Mewtwo-Mega-X @ Choice Band  
Ability: Adaptability  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naughty Nature  
- Close Combat  
- Thousand Arrows  
- Ice Beam  
- Sunsteel Strike

Kyogre-Primal @ Choice Scarf  
Ability: Primordial Sea  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Mild Nature  
IVs: 0 Atk  
- Water Spout  
- Ice Beam  
- Signal Beam  
- Earth Power

Xerneas @ Choice Specs  
Ability: Fairy Aura  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Rash Nature  
IVs: 0 Atk  
- Moonblast  
- Fusion Flare  
- Psystrike  
- Aura Sphere

Thundurus (M) @ Choice Scarf  
Ability: No Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- Blizzard  
- Thunder  
- Focus Blast  
- Earth Power

Regigigas @ Toxic Orb  
Ability: Guts  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Close Combat  
- Sucker Punch  
- Ice Punch  
- Extreme Speed

Genesect @ Choice Scarf  
Ability: Primordial Sea  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- Water Spout  
- X-Scissor  
- Flash Cannon  
- Ice Beam