Dialga @ Shed Shell  
Ability: Magic Bounce  
EVs: 248 HP / 8 SpA / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Draco Meteor  
- Milk Drink  
- Spikes  
- Taunt  

Rayquaza-Mega @ Sky Plate  
Ability: Turboblaze  
EVs: 64 HP / 252 SpA / 192 Spe  
Modest Nature  
IVs: 0 Atk  
- Substitute  
- Quiver Dance  
- Oblivion Wing  
- Dark Void  

Rayquaza-Mega @ Sky Plate  
Ability: Gale Wings  
EVs: 248 HP / 252 SpA / 4 SpD / 4 Spe  
Modest Nature  
IVs: 0 Atk  
- Oblivion Wing  
- Chatter  
- Taunt  
- Spikes  

Mewtwo-Mega-X @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 Atk / 236 Def / 20 Spe  
Adamant Nature  
- Ice Punch  
- Low Kick  
- Dragon Ascent  
- Knock Off  

Gyarados-Mega @ Toxic Orb  
Ability: Poison Heal  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Psycho Shift  
- Foul Play  
- King's Shield  
- Recover  

Audino-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Recover  
- Chatter  
- Defog  
- Baton Pass