Heracross-Mega @ Focus Sash  
Ability: Parental Bond  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Storm Throw  
- First Impression  
- Sunsteel Strike  
- Spectral Thief  

Regigigas @ Lum Berry  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Sunsteel Strike  
- Extreme Evoboost  
- Sacred Fire  
- Extreme Speed  

Mewtwo-Mega-X @ Focus Sash  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Extreme Speed  
- Spectral Thief  
- Storm Throw  
- Photon Geyser  

Groudon-Primal @ Focus Sash  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 Spe  
Naive Nature  
IVs: 0 SpD  
- V-create  
- Oceanic Operetta  
- Searing Sunraze Smash  
- Stealth Rock  

Meloetta @ Focus Sash  
Ability: Mold Breaker  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Mild Nature  
- Spectral Thief  
- Genesis Supernova  
- Shell Smash  
- Boomburst  

Mewtwo-Mega-Y @ Focus Sash  
Ability: Dazzling  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Moongeist Beam  
- Shell Smash  
- Moonblast  
- Photon Geyser