However, that doesn't mean that they can't change it.
Yes, we did: Tentacool, Tentacruel and Qwilfish.Anyway, I'd love for a Grass/Steel! Have you seen a Chespin evo where he's actually Grass/Steel. It's epic. Just search up Chespin evolution and it should come up, although some people say it looks a little like Excadrill. Have we ever had a Water/Poison anyway?