Mewtwo-Mega-Y @ Mewtwonite Y  
Ability: Pressure  
EVs: 4 Atk / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Calm Mind  
- Psystrike  
- Fire Blast  
- Ice Beam  

Arceus-Dark @ Dread Plate  
Ability: Multitype  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Refresh  
- Recover  
- Calm Mind  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 248 HP / 196 Def / 64 Spe  
Bold Nature  
IVs: 0 Atk  
- Moonblast  
- Rest  
- Sleep Talk  
- Geomancy  

Giratina-Origin @ Griseous Orb  
Ability: Levitate  
EVs: 152 HP / 252 Def / 96 SpA / 8 Spe  
Modest Nature  
IVs: 0 Atk  
- Hex  
- Draco Meteor  
- Toxic  
- Defog  

Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Transform  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 248 HP / 248 SpD / 12 Spe  
Sassy Nature  
- Precipice Blades  
- Lava Plume  
- Roar  
- Stealth Rock