Giratina @ Leftovers  
Ability: Prankster  
EVs: 252 HP / 236 Def / 20 Spe  
Impish Nature  
IVs: 0 Atk  
- Baton Pass  
- Encore  
- Curse  
- Milk Drink  

Yveltal @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 108 Def / 148 SpD  
Careful Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Foul Play  
- King's Shield  
- Slack Off  

Registeel @ Shed Shell  
Ability: Magic Bounce  
EVs: 252 HP / 4 Def / 252 SpD  
Careful Nature  
- Iron Head  
- Whirlwind  
- Heal Order  
- Aromatherapy  

Yveltal @ Choice Scarf  
Ability: Huge Power  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Ascent  
- Pursuit  
- Trick  
- Spikes  

Audino-Mega @ Shed Shell  
Ability: Wonder Guard  
Shiny: Yes  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Wish  
- Stealth Rock  
- Roost  
- Chatter  

Swampert-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 252 Def / 8 SpD  
Relaxed Nature  
IVs: 1 Spe  
- Knock Off  
- Defog  
- Will-O-Wisp  
- Soft-Boiled