Rayquaza-Mega @ Life Orb  
Ability: Contrary  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naive Nature  
- Substitute  
- Leech Seed  
- Draco Meteor  
- V-create  

Diancie @ Leftovers  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Sassy Nature  
- Core Enforcer  
- Topsy-Turvy  
- Shore Up  
- Spirit Shackle  

Ho-Oh @ Life Orb  
Ability: Magic Guard  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Flare Blitz  
- Low Kick  
- Recover  
- Spectral Thief  

Giratina @ Griseous Orb  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Core Enforcer  
- Will-O-Wisp  
- Shore Up  
- Topsy-Turvy  

Mewtwo-Mega-X @ Expert Belt  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Low Kick  
- Sunsteel Strike  
- Extreme Speed  
- Toxic  

Dialga @ Steelium Z  
Ability: Mummy  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Doom Desire  
- Tail Glow  
- Earth Power  
- Shore Up