Steelix-Mega @ Shed Shell  
Ability: Magic Bounce  
EVs: 252 HP / 172 Def / 84 SpD  
Bold Nature  
IVs: 30 Spe
- Perish Song  
- Aromatherapy  
- Recover  
- Iron Head

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

Giratina @ Griseous Orb  
Ability: Prankster  
EVs: 248 HP / 252 Def / 8 Spe  
Bold Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Encore  
- Curse  
- Roost  

Blissey (F) @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 48 Def / 208 SpD  
Careful Nature  
- Recover  
- Transform  
- Switcheroo  
- Stealth Rock  

Slowbro-Mega @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 64 Def / 192 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Psycho Shift  
- Scald  
- King's Shield  
- Magma Storm  

Yveltal @ Assault Vest  
Ability: Regenerator  
EVs: 248 HP / 8 Def / 252 SpD  
Careful Nature  
IVs: 18 Spe  
- Knock Off  
- Pursuit  
- Poison Fang  
- Circle Throw