Yveltal @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Hasty Nature  
- Beat Up  
- Let's Snuggle Forever  
- Menacing Moonraze Maelstrom  
- Trick  

Rayquaza-Mega @ Focus Sash  
Ability: Triage  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Oblivion Wing  
- Moongeist Beam  
- Bug Buzz  

Audino-Mega @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- U-turn  
- Stealth Rock  
- Roost  
- Spectral Thief  

Chansey (F) @ Lum Berry  
Ability: Innards Out  
EVs: 252 HP / 252 Atk / 252 SpD  
Gentle Nature  
IVs: 0 Def  
- Magic Coat  
- Defog  
- Shore Up  
- U-turn  

Slaking @ Leppa Berry  
Ability: Harvest  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Impish Nature  
- Extreme Evoboost  
- Searing Sunraze Smash  
- Substitute  
- Roost  

Mewtwo-Mega-Y @ Leppa Berry  
Ability: Innards Out  
EVs: 252 HP / 252 SpA / 252 SpD / 252 Spe  
Mild Nature  
- Shell Smash  
- Light That Burns the Sky  
- Photon Geyser  
- Moongeist Beam