Heatran @ Binding Band  
Ability: Flame Body  
Tera Type: Fire  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Magma Storm  
- Earth Power  
- Echo Chamber  
- Stealth Rock

Heatran is pretty good against magnezone, with its 4x resist to Echo Chamber, ability to take advantage when it heals, and generally being a hazard setter that doesn't care much about magnezone makes it a good way to pressure it. By using Magnezone, Heatran can activate binding band against other pokemon who want to take Magma Storm and making progress that way