Eternatus @ Choice Specs  
Ability: Dragon's Maw  
Tera Type: Poison  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Dragon Energy  
- Draco Meteor  
- Malignant Chain  
- Volt Switch  

Steelix-Mega @ Leftovers  
Ability: Levitate  
Tera Type: Steel  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Defog  
- Haze  
- Precipice Blades  
- Shore Up  

Garchomp-Mega @ Life Orb  
Ability: Tough Claws  
Tera Type: Dragon  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Naughty Nature  
- Dragon Dance  
- Headlong Rush  
- Sunsteel Strike  
- Electro Drift  

Arceus-Electric @ Heavy-Duty Boots  
Ability: Fur Coat  
Tera Type: Fighting  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
- Mortal Spin  
- Thunder Cage  
- Spikes  
- Strength Sap  

Meloetta @ Heavy-Duty Boots  
Ability: Ice Scales  
Tera Type: Normal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Nuzzle  
- Topsy-Turvy  
- Teleport  
- Shore Up  

Dialga-Origin @ Assault Vest  
Ability: Regenerator  
Tera Type: Steel  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Knock Off  
- Salt Cure  
- Rapid Spin  
- U-turn