Who else thinks Steelworker was a brilliant idea for an ability? People have been talking about triple type mons since gen 1, and this was a perfect way to implement it.
ITT Other mons that should have similar type-adding abilities. I'll post the obvious ones:
Stunfisk- Water
Staraptor- Fighting
Volcarona- Flying
Masquerain- Water
Bewear- Fairy
Octillery- Fire
Kommo-o- Steel