Gyarados-Mega @ Toxic Orb  
Ability: Poison Heal  
Tera Type: Water  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- Fishious Rend  
- Ceaseless Edge  
- Will-O-Wisp / Glare  
- Rapid Spin

Swampert-Mega @ Toxic Orb  
Ability: Poison Heal  
Tera Type: Water  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful / Impish Nature  
- Flip Turn  
- Thousand Waves
- Knock Off / Stone Axe / Ceaseless Edge
- Spiky Shield / Baneful Bunker

Arceus-Fairy @ Toxic Orb  
Ability: Poison Heal  
Tera Type: Fire  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Moonblast  
- Magma Storm / Glare
- Quiver Dance  
- Strength Sap

Eternatus @ Heavy-Duty Boots  
Ability: Regenerator  
Tera Type: Fairy  
EVs: 252 HP / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Dragon Energy  
- Ceaseless Edge / Stone Axe
- Final Gambit  
- Volt Switch / U-Turn

Groudon @ Red Orb  
Ability: Dauntless Shield / Intrepid Sword 
Tera Type: Grass  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Adamant Nature  
- V-create  
- Solar Beam / Electro Drift
- Stone Axe / Mortal Spin / Ceaseless Edge
- Synthesis / Heal Order

Zacian-Crowned @ Covert Cloak / Rocky Helmet
Ability: Primordial Sea  
Tera Type: Water  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Magical Torque  
- Fishious Rend  
- Rapid Spin / Ceaseless Edge
- Heal Order