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

Ferrothorn @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 168 Def / 92 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Whirlwind  
- Roost  
- Baton Pass  
- Defog  

Diancie-Mega @ Shed Shell  
Ability: Pixilate  
EVs: 248 HP / 252 Atk / 4 SpA  
Brave Nature  
- Fake Out  
- Extreme Speed  
- Boomburst  
- Pain Split  

Latios-Mega (M) @ Soul Dew  
Ability: Mold Breaker  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Substitute  
- Spore  
- Spacial Rend  
- Psystrike  

Blissey (F) @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 8 Def / 252 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Wish  
- Spiky Shield  
- Baton Pass  
- Aromatherapy  

Xerneas @ Pixie Plate  
Ability: Mold Breaker  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Judgment  
- Steam Eruption  
- King's Shield