Mewtwo-Mega-Y @ Choice Specs  
Ability: Merciless  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psycho Boost  
- Psystrike  
- Fleur Cannon  
- Overheat  

Cresselia @ Leftovers  
Ability: Prankster  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Haze  
- Encore  
- Soft-Boiled  
- U-turn  

Registeel @ Leftovers  
Ability: Flash Fire  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Anchor Shot  
- Entrainment  
- Heal Order  
- Topsy-Turvy  

the cheese touch (Pheromosa) @ Choice Band  
Ability: Poison Touch  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- U-turn  
- Close Combat  
- Sunsteel Strike  
- Knock Off  

Giratina @ Griseous Orb  
Ability: Comatose  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Toxic Spikes  
- Core Enforcer  
- Shore Up  
- U-turn  

Muk-Alola @ Assault Vest  
Ability: Regenerator  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Poison Fang  
- Knock Off  
- Rapid Spin  
- U-turn