Regigigas @ Sitrus Berry  
Ability: Unburden  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Belly Drum  
- Extreme Speed  
- Knock Off  
- Drain Punch  

Diancie-Mega @ Focus Sash  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Lonely Nature  
- Light of Ruin  
- Head Smash  
- Topsy-Turvy  
- Shell Smash  

Giratina @ Leftovers  
Ability: Unaware  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Spectral Thief  
- Recover  
- Baton Pass  
- Toxic Spikes  

Mewtwo-Mega-Y @ Life Orb  
Ability: Merciless  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psychic  
- Aura Sphere  
- Moonblast  
- Hex  

Gengar-Mega @ Safety Goggles  
Ability: Corrosion  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Toxic  
- Disable  
- Hex  

Greninja-Ash @ Life Orb  
Ability: Skill Link  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Water Shuriken  
- Icicle Spear  
- Rock Blast  
- U-turn