my honest reaction (Dialga-Origin)  
Ability: Wandering Spirit  
Hidden Power: Steel  
Tera Type: Ghost  
EVs: 20 HP / 252 Atk / 252 Def / 1 SpA / 252 SpD / 100 Spe  
Adamant Nature  
- Tidy Up  
- Poltergeist  
- Thunder Cage  
- Pain Split  

Giratina @ Assault Vest  
Ability: Regenerator  
Hidden Power: Dark  
Tera Type: Poison  
EVs: 252 HP / 70 Atk / 30 Def / 1 SpA / 120 SpD / 58 Spe  
Sassy Nature  
IVs: 0 Spe  
- Knock Off  
- Mortal Spin  
- Ceaseless Edge  
- U-turn  

Blissey @ Assault Vest  
Ability: Regenerator  
Hidden Power: Normal  
Tera Type: Fairy  
EVs: 252 HP / 1 Atk / 50 Def / 1 SpA / 100 SpD / 58 Spe  
Sassy Nature  
IVs: 0 Spe  
- Rapid Spin  
- Spectral Thief  
- Stone Axe  
- U-turn  

Arceus-Water @ Covert Cloak  
Ability: Fur Coat  
Hidden Power: Bug  
Tera Type: Water  
EVs: 252 HP / 1 Atk / 118 Def / 1 SpA / 50 SpD / 69 Spe  
Bold Nature  
- Anchor Shot  
- Salt Cure  
- Heal Order  
- Spectral Thief  

Audino-Mega @ Heavy-Duty Boots  
Ability: Fur Coat  
Hidden Power: Dark  
Tera Type: Dark  
EVs: 252 HP / 70 Atk / 100 Def / 1 SpA / 50 SpD / 60 Spe  
Impish Nature  
- Topsy-Turvy  
- Anchor Shot  
- Heal Order  
- Knock Off  

Chansey @ Toxic Orb  
Ability: Imposter  
Hidden Power: Bug  
Tera Type: Bug  
EVs: 252 HP / 1 Atk / 22 Def / 1 SpA / 1 SpD / 69 Spe  
Bold Nature  
- Fling  
- Refresh  
- Life Dew  
- Thief