Deoxys-Speed @ Mental Herb  
Ability: Teravolt  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Taunt  
- Stealth Rock  
- Spikes  
- Rapid Spin  

Mewtwo-Mega-X @ Focus Sash  
Ability: Dazzling  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Lonely Nature  
- Shell Smash  
- Stored Power  
- Close Combat  
- Spectral Thief  

Swampert-Mega @ Sitrus Berry  
Ability: Unburden  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Belly Drum  
- Waterfall  
- Bone Rush  
- Sunsteel Strike  

Yveltal @ Safety Goggles  
Ability: Unaware  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Gentle Nature  
- Spectral Thief  
- Revelation Dance  
- Heal Order  
- Baton Pass  

Diancie-Mega @ Choice Band  
Ability: Tinted Lens  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Diamond Storm  
- V-create  
- Sunsteel Strike  
- Accelerock  

Gengar-Mega @ Spooky Plate  
Ability: Normalize  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Entrainment  
- Quiver Dance  
- Boomburst  
- Judgment