Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 8 Atk / 252 Def  
Impish Nature  
- Transform  

Arceus-Ground @ Earth Plate  
Ability: Multitype  
EVs: 40 HP / 252 SpA / 216 Spe  
Modest Nature  
IVs: 0 Atk  
- Calm Mind  
- Recover  
- Ice Beam  
- Judgment  

Xerneas @ Power Herb  
Ability: Fairy Aura  
EVs: 80 HP / 4 Def / 252 SpA / 160 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Substitute  
- Thunder  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 248 HP / 148 Def / 104 SpD  
Relaxed Nature  
- Stealth Rock  
- Lava Plume  
- Dragon Tail  
- Toxic  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 248 HP / 8 SpA / 252 SpD  
Calm Nature  
IVs: 28 Spe  
- U-turn  
- Snarl  
- Roost  
- Defog  

Marshadow @ Choice Band  
Ability: Technician  
EVs: 40 HP / 252 Atk / 216 Spe  
Jolly Nature  
- Spectral Thief  
- Pursuit  
- Shadow Sneak  
- Close Combat