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

Diancie-Mega @ Lum Berry  
Ability: Pixilate  
EVs: 248 HP / 252 Atk / 8 SpD  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Taunt  
- Pain Split  

Groudon-Primal @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 8 Atk / 252 Spe  
Jolly Nature  
- Substitute  
- Baton Pass  
- Sacred Fire  
- Taunt  

Rayquaza-Mega @ Shed Shell  
Ability: Mold Breaker  
EVs: 192 HP / 252 SpA / 64 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Oblivion Wing  
- Earth Power  
- Dark Void  

Xerneas @ Safety Goggles  
Ability: Wonder Guard  
EVs: 252 Def / 252 SpA / 4 SpD  
Modest Nature  
IVs: 0 Atk  
- Moonblast  
- Roost  
- Defog  
- Baton Pass  

Dialga @ Shed Shell  
Ability: Magic Bounce  
EVs: 248 HP / 8 SpA / 252 SpD  
Modest Nature  
IVs: 0 Atk  
- Doom Desire  
- Dragon Pulse  
- Taunt  
- Roost