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

Mewtwo (Mewtwo-Mega-Y) @ Mewtwonite Y  
Ability: Unnerve  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psystrike  
- Fire Blast  
- Ice Beam  
- Future Sight  

Marshadow @ Life Orb  
Ability: Technician  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Spectral Thief  
- Close Combat  
- Shadow Sneak  
- Pursuit  

Groudon (Groudon-Primal) @ Red Orb  
Ability: Desolate Land  
EVs: 252 HP / 4 Def / 252 SpD  
Sassy Nature  
- Stealth Rock  
- Precipice Blades  
- Overheat  
- Toxic  

Magearna @ Normalium Z  
Ability: Soul-Heart  
EVs: 248 HP / 8 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Fleur Cannon  
- Volt Switch  
- Heart Swap  
- Heal Bell  

Yveltal @ Choice Band  
Ability: Dark Aura  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Knock Off  
- Sucker Punch  
- U-turn  
- Toxic