Gyarados @ Gyaradosite  
Ability: Magic Bounce  
EVs: 32 HP / 252 Atk / 4 Def / 220 Spe  
Adamant Nature  
- Shell Smash  
- Spore  
- Knock Off  
- Gunk Shot  

Groudon-Primal @ Mental Herb  
Ability: Mold Breaker  
EVs: 200 HP / 252 Atk / 56 Spe  
Adamant Nature  
- Dark Void  
- Shell Smash  
- King's Shield  
- Thousand Arrows  

Rayquaza-Mega @ Choice Specs  
Ability: Gale Wings  
EVs: 248 HP / 8 Def / 252 SpA  
Modest Nature  
IVs: 0 Atk  
- Chatter  
- Oblivion Wing  
- Trick  
- Stealth Rock  

Gengar-Mega @ Black Sludge  
Ability: Wonder Guard  
EVs: 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Baton Pass  
- Shadow Ball  
- Toxic Spikes  

Audino-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 8 Def / 252 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Roost  
- Defog  
- Aromatherapy  
- Parting Shot  

Giratina @ Safety Goggles  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Encore  
- Roost  
- Destiny Bond