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

Celesteela @ Leftovers  
Ability: Beast Boost  
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Leech Seed  
- Toxic  
- Protect  
- Heavy Slam  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 88 Atk / 252 SpA / 168 Spe  
Mild Nature  
- Rock Tomb  
- Eruption  
- Stealth Rock  
- Precipice Blades  

Salamence-Mega @ Salamencite  
Ability: Aerilate  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Earthquake  
- Double-Edge  
- Roost  

Arceus-Ground @ Earth Plate  
Ability: Multitype  
EVs: 252 HP / 64 Def / 192 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Ice Beam  
- Recover  
- Defog  

Xerneas @ Fairium Z  
Ability: Fairy Aura  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Rest  
- Sleep Talk