Mewtwo-Mega-Y @ Mewtwonite Y  
Ability: Insomnia  
EVs: 248 HP / 8 Def / 252 SpA  
Modest Nature  
IVs: 0 Atk  
- Psystrike  
- Future Sight  
- Fire Blast  
- Recover  

Marshadow @ Choice Band  
Ability: Technician  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Poltergeist  
- Close Combat  
- Rock Tomb  
- Shadow Sneak  

Arceus-Dark @ Dread Plate  
Ability: Multitype  
EVs: 248 HP / 172 SpD / 88 Spe  
Calm Nature  
IVs: 0 Atk  
- Judgment  
- Whirlpool  
- Perish Song  
- Recover  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Sunsteel Strike  
- Knock Off  
- Stealth Rock  
- Moonlight  

Arceus-Water @ Splash Plate  
Ability: Multitype  
EVs: 248 HP / 136 Def / 124 Spe  
Bold Nature  
IVs: 0 Atk  
- Ice Beam  
- Toxic  
- Refresh  
- Recover  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 128 Atk / 128 SpA / 252 Spe  
Naive Nature  
- Eruption  
- Fire Blast  
- Precipice Blades  
- Stone Edge