Magearna @ Sablenite  
Ability: Soul-Heart  
EVs: 252 HP / 4 Def / 252 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Fleur Cannon  
- Volt Switch  
- Pain Split  
- Heart Swap  

Toxapex @ Latiasite  
Ability: Regenerator  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Scald  
- Toxic  
- Haze  
- Recover  

Mew @ Manectite  
Ability: Synchronize  
EVs: 252 HP / 160 Def / 96 Spe  
Timid Nature  
IVs: 0 Atk  
- Ice Beam   
- Earth Power / Will-O-Wisp
- Defog  
- Soft-Boiled