Event Horizon (Dialga-Origin) @ Steelium Z  
Ability: Toxic Debris  
Tera Type: Water  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
- Doom Desire  
- Dragon Tail  
- Ceaseless Edge  
- Strength Sap  

Arceus-Ghost @ Spooky Plate  
Ability: Mold Breaker  
Tera Type: Ghost  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Secret Sword  
- Tail Glow  
- Strength Sap  

Venusaur-Mega @ Covert Cloak  
Ability: Prankster  
Tera Type: Dark  
EVs: 252 HP / 252 Def / 252 SpD / 252 Spe  
Calm Nature  
IVs: 0 Atk  
- Haze  
- Will-O-Wisp  
- Mortal Spin  
- Heal Order  

Dondozo @ Heavy-Duty Boots  
Ability: Fur Coat  
Tera Type: Dragon  
EVs: 248 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Core Enforcer  
- Rapid Spin  
- Heal Order  
- U-turn  

Zacian-Crowned @ Choice Band  
Ability: Purifying Salt  
Tera Type: Fairy  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Magical Torque  
- Spectral Thief  
- Trick  
- Heal Order  

Chansey @ Eviolite  
Ability: Imposter  
Tera Type: Electric  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Calm Nature  
- Court Change  
- Heal Order  
- Spectral Thief  
- Aromatherapy