Nihilego @ Black Sludge  
Ability: Beast Boost  
EVs: 24 HP / 44 Def / 88 SpA / 120 SpD / 232 Spe  
Timid Nature  
IVs: 0 Atk  
- Power Gem  
- Clear Smog  
- Toxic Spikes  
- Pain Split  

Celesteela @ Leftovers  
Ability: Beast Boost  
EVs: 248 HP / 104 Atk / 152 Def / 4 Spe  
Impish Nature  
- Leech Seed  
- Heavy Slam  
- Toxic  
- Protect  

Zygarde-Complete @ Leftovers  
Ability: Power Construct  
EVs: 228 Atk / 48 SpD / 232 Spe  
Adamant Nature  
- Dragon Dance  
- Thousand Arrows  
- Substitute  
- Protect  

Groudon @ Red Orb  
Ability: Drought  
EVs: 252 HP / 56 Def / 200 SpD  
Relaxed Nature  
- Stealth Rock  
- Earthquake  
- Overheat  
- Roar  

Xerneas @ Choice Scarf  
Ability: Fairy Aura  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moonblast  
- Defog  
- Focus Blast  
- Aromatherapy  

Kyogre @ Blue Orb  
Ability: Drizzle  
EVs: 32 HP / 160 Atk / 64 Def / 252 Spe  
Adamant Nature  
- Liquidation  
- Earthquake  
- Ice Beam  
- Thunder