Gyarados-Mega @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 128 Def / 128 SpD  
Impish Nature  
- Defog  
- Crabhammer  
- King's Shield  
- Aromatherapy  

Registeel @ Leftovers  
Ability: Magic Bounce  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Perish Song  
- Roost  
- Stealth Rock  
- Parting Shot  

Regigigas @ Safety Goggles  
Ability: Shadow Tag  
EVs: 252 Atk / 128 Def / 128 SpD  
Adamant Nature  
- Taunt  
- Extreme Speed  
- Spikes  
- Fake Out  

Xerneas @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Wish  
- Substitute  
- Baton Pass  
- Moonblast  

Sableye-Mega @ Flame Orb  
Ability: Wonder Guard  
Level: 2  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Psycho Shift  
- Pain Split  
- Curse  
- Baton Pass  

Rayquaza-Mega @ Choice Band  
Ability: Teravolt  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Ascent  
- Extreme Speed  
- Trick  
- Parting Shot