Slaking @ Ability Shield  
Ability: Wonder Guard  
Tera Type: Normal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Imprison  
- Shell Smash  
- Photon Geyser  
- Rage Fist  

Mewtwo-Mega-X @ Choice Scarf  
Ability: Shadow Tag  
Tera Type: Psychic  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Photon Geyser  
- Ceaseless Edge  
- Revival Blessing  
- Last Respects  

Slaking @ Toxic Orb  
Ability: Poison Heal  
Tera Type: Normal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Impish Nature  
- Imprison  
- Substitute  
- Photon Geyser  
- Ceaseless Edge  

Mewtwo-Mega-X @ Leppa Berry  
Ability: Neutralizing Gas  
Tera Type: Psychic  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Ceaseless Edge  
- Last Respects  
- Revival Blessing  
- Lumina Crash  

Slaking @ Toxic Orb  
Ability: Poison Heal  
Tera Type: Normal  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Substitute  
- Quiver Dance  
- Spore  
- Baton Pass  

Mewtwo-Mega-Y @ Leftovers  
Ability: Neutralizing Gas  
Tera Type: Psychic  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Quiver Dance  
- Photon Geyser  
- Ceaseless Edge  
- Imprison