Well there are ghost types but other than that, I am not sure! There might be, there might not be... I haven't run across any though.

[He just assumes that "normal" ghosts here are like Earth ghosts.]

Oh, a Trapinch! Hehe, well in that case it might be something he grows out of as he evolves? I have a Flygon myself, but it didn't belong to me originally so I don't really know a whole lot about the line myself. But Trapinch always kind of looked like a biter to me. If nothing else, its mouth shrinks as it evolves and it gets less... toothy.