Mewtwo-Mega-Y @ Mind Plate  
Ability: Contrary  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Lovely Kiss  
- Psycho Boost  
- Overheat  
- Moongeist Beam  

Tyranitar-Mega @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Pursuit  
- Shore Up  
- Knock Off  
- Topsy-Turvy  

Chansey @ Shed Shell  
Ability: Imposter  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Bold Nature  
- Soft-Boiled  
- Trick  
- Whirlwind  
- Metal Burst  

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Topsy-Turvy  
- Shore Up  
- Entrainment  
- U-turn  

Ferrothorn @ Leftovers  
Ability: Flash Fire  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Anchor Shot  
- Spectral Thief  
- Entrainment  
- Shore Up  

Diancie-Mega @ Groundium Z  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Boomburst  
- Extreme Speed  
- Thousand Waves  
- Bolt Strike