Tried this on a whim since I had one lying around and it works very well on Iron Valiant.
Metal Bear strat for Iron Valiant. This went like:
Charm, Belly Drum, Heavy Slam until Tera.
Heavy Slam until it resets your stats.
Belly Drum again.
Heavy Slam until victory.
Having an attack dropper or Arboliva helps a lot since its special moves can't hit Ursaluna at all!
I've tried this set with the least helpful teams, such as Haxorus / Corviknight / Clodsire, which have no attack drop, heals, or terrain, and it still works.
There's a variant of the EVs with Defense investment instead of HP. I only tested the HP variant.
Ursaluna (F) @ Shell Bell
Ability: Bulletproof
Tera Type: Steel
EVs: 252 HP / 252 Atk / 6 Def
Adamant Nature
- Heavy Slam
- Belly Drum
- Charm
- Swords Dance (didn't use but backup in case too low HP to BD)