Stealth Rock (Sandaconda) @ Rocky Helmet / Leftovers
Ability: Shed Skin  
Tera Type: Ghost / Water / Dragon
EVs: 252 HP / 252 Def / 4 SpD  
Impish Nature  
- Stealth Rock  
- Earthquake  
- Stone Edge / Rock Blast / Glare
- Rest / Glare

Coil (Sandaconda) @ Loaded Dice / Leftovers
Ability: Shed Skin  
Tera Type: Dragon / Steel
EVs: 252 HP / 4 SpD / 252 Spe  
Jolly Nature  
- Coil  
- Earthquake  
- Scale Shot / Stone Edge
- Rest / Substitute

Other Options
Tera Types: Fairy, Fire, Grass, Poison
Moves:
- High Horsepower
- Skitter Smack