Iron Treads @ Assault Vest  
Ability: Momentum  
Tera Type: Ground  
EVs: 252 HP / 4 SpD / 252 Spe  
Jolly Nature  
- Earthquake  
- Rapid Spin  
- Knock Off  
- Rollout

Iron treads is pretty darn good at taking advantage of jolteon and being able to stop tbolt spam, with momentum and its good sp. def bulk it can easily take any hit it wants to throw at it and with being hard to wear down from hazards it cna easily come in over and over and rollout or spin to gain momentum for the user's team. 
Although it has to be wary as shadow ball does good amounts of damage and can bring iron treads down over time.