I would have also said Iron hands but oh well
It's likely that the last mon is a fighting type, the FWG core is already satisfied. However another important type this team lacks is a ground.
Great Tusk @ Leftovers
Ability: Protosynthesis
Tera Type: Fairy
- Stealth Rock
- Body Press
- High Horsepower
- Bulk Up
I decided the team probably wants rocks more, and Tusk has the added benefit of passing Bulk Up to Ogerpon so it can act as a secondary wincon. Of course, Tusk itself can act as a wincon, with strong Body Presses and High Horsepowers. I didn't do EVs because I'm lazy!
Alternatively if you think the team doesn't need rocks, it could easily be Booster Speed Bulk Up to try and win a game first, but with the prevalence of Intimidate I really don't like this idea.