Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 252 Def  
Relaxed Nature  
IVs: 0 Spe  
- Transform  

Rayquaza-Mega @ Focus Sash  
Ability: Delta Stream  
EVs: 252 Atk / 4 SpA / 252 Spe  
Lonely Nature  
- Dragon Ascent  
- V-create  
- Draco Meteor  
- Extreme Speed  

Zacian-Crowned @ Rusted Sword  
Ability: Intrepid Sword  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Close Combat  
- Play Rough  
- Wild Charge  
- Behemoth Blade  

Yveltal @ Assault Vest  
Ability: Dark Aura  
EVs: 136 HP / 4 Def / 100 SpA / 12 SpD / 224 Spe  
Modest Nature  
- Dark Pulse  
- Heat Wave  
- Sucker Punch  
- Oblivion Wing  

Marshadow @ Focus Sash  
Ability: Technician  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Shadow Sneak  
- Spectral Thief  
- Close Combat  
- Endeavor  

Ho-Oh @ Leftovers  
Ability: Regenerator  
EVs: 248 HP / 252 Def / 4 SpD / 4 Spe  
Impish Nature  
- Sacred Fire  
- Roost  
- Whirlwind  
- Defog