Mewtwo-Mega-Y @ Life Orb  
Ability: Stakeout  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Photon Geyser  
- Fleur Cannon  
- Thousand Arrows  
- Moongeist Beam  

Groudon-Primal @ Grassium Z  
Ability: Arena Trap  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Beat Up  
- Encore  
- Perish Song  
- Strength Sap  

Slaking @ Leppa Berry  
Ability: Harvest  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Substitute  
- Extreme Evoboost  
- Searing Sunraze Smash  
- Shore Up  

Meloetta @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Baton Pass  
- Spectral Thief  
- Defog  
- Shore Up  

Blissey (F) @ Leftovers  
Ability: Innards Out  
EVs: 252 HP / 252 SpA / 252 SpD / 252 Spe  
Gentle Nature  
IVs: 0 Atk / 0 Def  
- Spikes  
- Final Gambit  
- Shore Up  
- Baton Pass  

Mewtwo-Mega-Y @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Fissure  
- Shell Smash  
- Photon Geyser  
- Magma Storm