Mewtwo-Mega-X @ Choice Band  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Sunsteel Strike  
- Photon Geyser  
- Shadow Sneak  
- Sacred Sword  

Steelix-Mega @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Haze  
- Shore Up  
- Taunt  

Gengar-Mega @ Focus Sash  
Ability: Dazzling  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moongeist Beam  
- Sludge Wave  
- Shell Smash  
- Bug Buzz  

Chansey (F) @ Eviolite  
Ability: Imposter  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Seismic Toss  
- Stealth Rock  
- Heal Bell  
- Parting Shot  

Dialga @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Shore Up  
- Stealth Rock  
- Parting Shot  
- Defog  

Groudon-Primal @ Ground Memory  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Multi-Attack  
- Shell Smash  
- Ice Shard  
- Sunsteel Strike