Houndoom-Mega (M) @ Earth Plate  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
- Shell Smash  
- Judgment  
- Photon Geyser  
- Taunt  

Yveltal @ Leppa Berry  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Extreme Evoboost  
- Power Trip  
- Searing Sunraze Smash  
- Recycle  

Slaking @ Leppa Berry  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Recycle  
- Extreme Evoboost  
- Searing Sunraze Smash  
- Shore Up  

Mewtwo-Mega-Y @ Focus Sash  
Ability: No Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
IVs: 0 Atk  
- Toxic Spikes  
- Sing  
- Sticky Web  
- Fissure  

Blissey (F) @ Safety Goggles  
Ability: Innards Out  
EVs: 252 HP / 252 SpA / 252 SpD / 252 Spe  
Gentle Nature  
IVs: 0 Atk / 0 Def  
- Shore Up  
- Defog  
- Magic Coat  
- Volt Switch  

Sableye-Mega @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Parting Shot  
- Spectral Thief  
- Shore Up  
- Aromatherapy