"You do know I'm not all that good at waiting, right?" It's mostly being grumpy for the sake of being grumpy. If waiting's what's needed in order to find this Pokemon, then the Doctor doesn't mind waiting and hiding in the bushes or what have you.

He won't like it, of course, but liking's a whole different thing entirely. You don't have to like it in order to do it.

"Still, there's trees and bushes over there we could actually do the hiding in."