Eternatus @ Mental Herb  
Ability: Mold Breaker  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Spikes  
- Final Gambit  
- Taunt  
- Spiky Shield  

Zacian-Crowned @ Rusted Sword  
Ability: Intrepid Sword  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Bolt Strike  
- V-create  
- Glacial Lance  
- U-turn  

Blissey (F) @ Choice Scarf  
Ability: Imposter  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Trick  
- Final Gambit  
- Whirlwind  
- U-turn  

Dialga @ Choice Scarf  
Ability: Magic Guard  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Dragon Energy  
- Steel Beam  
- Trick  
- Strength Sap  

Palkia @ Sitrus Berry  
Ability: Unburden  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Belly Drum  
- Fishious Rend  
- Dragon Darts  
- Glare  

Regigigas @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Spore  
- Dragon Dance  
- Facade  
- Spectral Thief