Mewtwo-Mega-Y @ Mewtwonite Y  
Ability: Pressure  
EVs: 248 HP / 48 Def / 20 SpA / 192 Spe  
Timid Nature  
IVs: 0 Atk  
- Psystrike  
- Fire Blast  
- Ice Beam  
- Recover  

Toxapex @ Shed Shell  
Ability: Regenerator  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Toxic  
- Toxic Spikes  
- Recover  
- Haze  

Arceus-Steel @ Iron Plate  
Ability: Multitype  
EVs: 112 HP / 144 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Perish Song  
- Recover  
- Stealth Rock  

Blissey @ Shed Shell  
Ability: Natural Cure  
EVs: 252 Def / 252 SpD / 4 Spe  
Calm Nature  
IVs: 0 Atk  
- Toxic  
- Confide  
- Soft-Boiled  
- Heal Bell  

Zygarde-Complete @ Leftovers  
Ability: Power Construct  
EVs: 248 HP / 8 Atk / 252 Def  
Impish Nature  
- Thousand Arrows  
- Dragon Tail  
- Rest  
- Coil  

Arceus-Dark @ Dread Plate  
Ability: Multitype  
EVs: 248 HP / 252 Def / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Judgment  
- Ice Beam  
- Recover  
- Will-O-Wisp