Heatran @ Leftovers  
Ability: Flash Fire  
Tera Type: Grass  
EVs: 252 HP / 120 SpD / 136 Spe  
Calm Nature  
IVs: 0 Atk  
- Magma Storm  
- Earth Power  
- Stealth Rock / Toxic
- Taunt 

Tangrowth @ Rocky Helmet  
Ability: Regenerator  
Tera Type: Water / Steel / Poison
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
- Giga Drain  
- Sleep Powder  
- Earthquake  
- Knock Off / Hidden Power [Fire] / Hidden Power [Ice]

Toxapex @ Heavy-Duty Boots  
Ability: Regenerator  
Tera Type: Dragon  
EVs: 248 HP / 212 Def / 48 SpD  
Bold Nature  
- Scald  
- Toxic / Toxic Spikes  
- Haze  
- Recover