Mew @ Sitrus Berry  
Ability: Synchronize  
EVs: 252 HP / 4 SpD / 252 Spe  
Timid Nature  
- Fake Out  
- Transform  
- Toxic Spikes  
- Imprison  

Chansey (F) @ Eviolite  
Ability: Natural Cure  
EVs: 252 HP / 252 Def / 4 Spe  
Bold Nature  
IVs: 0 Atk  
- Seismic Toss  
- Soft-Boiled  
- Stealth Rock  
- Toxic  

Rillaboom @ Assault Vest  
Ability: Grassy Surge  
EVs: 252 HP / 224 SpD / 32 Spe  
Adamant Nature  
- Fake Out  
- Grassy Glide  
- Knock Off  
- U-turn  

Volcanion @ Leftovers  
Ability: Water Absorb  
EVs: 252 HP / 244 SpA / 12 Spe  
Modest Nature  
IVs: 0 Atk  
- Heat Wave  
- Steam Eruption  
- Substitute  
- Protect  

Diancie @ Leftovers  
Ability: Clear Body  
EVs: 252 HP / 252 Atk / 4 Def  
Sassy Nature  
IVs: 0 Spe  
- Diamond Storm  
- Body Press  
- Trick Room  
- Protect  

Landorus-Therian (M) @ Choice Band  
Ability: Intimidate  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Superpower  
- Knock Off  
- U-turn  
- Explosion