Mewtwo-Mega-Y @ Focus Sash  
Ability: Protean  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Moongeist Beam  
- Sunsteel Strike  
- Moonblast  
- Shell Smash  

Regigigas @ Lum Berry  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Extreme Speed  
- Sunsteel Strike  
- V-create  
- Shell Smash  

Blissey (F) @ Darkinium Z  
Ability: Innards Out  
EVs: 252 HP / 252 Atk / 252 SpA / 252 SpD  
Gentle Nature  
IVs: 0 Atk / 0 Def / 0 Spe  
- Toxic Spikes  
- Parting Shot  
- Magic Coat  
- Heal Order  

Diancie-Mega @ Leppa Berry  
Ability: Harvest  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naughty Nature  
- Shell Smash  
- Searing Sunraze Smash  
- Menacing Moonraze Maelstrom  
- Let's Snuggle Forever  

Bibarel @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Core Enforcer  
- Defog  
- Strength Sap  
- Stealth Rock  

Gengar-Mega (M) @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Fissure  
- Toxic Spikes  
- Moongeist Beam  
- Taunt