Blissey @ Safety Goggles  
Ability: Innards Out  
EVs: 252 HP / 252 Atk / 252 SpA / 252 SpD  
Gentle Nature  
IVs: 0 Def / 0 Spe  
- Soft-Boiled  
- Spectral Thief  
- Baton Pass  
- Spikes  

Audino-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Recover  
- Defog  
- King's Shield  
- U-turn  

Mewtwo-Mega-Y @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Stealth Rock  
- Spore  
- Photon Geyser  
- Fissure  

Regigigas @ Silk Scarf  
Ability: Huge Power  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Sunsteel Strike  
- Pursuit  

Hoopa-Unbound @ Pixie Plate  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Rash Nature  
- Photon Geyser  
- Judgment  
- Thousand Arrows  
- Shell Smash  

Steelix-Mega @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Shore Up  
- Haze  
- Thousand Waves  
- Reflect