Alakazam-Mega @ Lum Berry  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Zap Cannon  
- Magma Storm  
- Blizzard  
- Strength Sap  

Mewtwo-Mega-Y @ Life Orb  
Ability: Magic Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
- Photon Geyser  
- Light of Ruin  
- Mind Blown  
- Quiver Dance  

Mewtwo-Mega-X @ Choice Band  
Ability: Adaptability  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Jolly Nature  
- Photon Geyser  
- Close Combat  
- Knock Off  
- U-turn  

Arceus @ Rocky Helmet  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Haze  
- Defog  
- Stealth Rock  
- U-turn  

Groudon @ Red Orb  
Ability: Download  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Precipice Blades  
- Icicle Crash  
- Shift Gear  

Kyogre-Primal @ Choice Scarf  
Ability: Primordial Sea  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Water Spout  
- Origin Pulse  
- Thunder  
- Trick