*as I re-enter the Gym when they try to leave:* "Wow, it's really coming down out there~ Oh? When did you get here? Me? I was just out taking a walk... Well, as long as we're here, we may as well battle!"
I'd be using Fairy-types. And Castform, because Castform is totally 'close enough'.
Official Bride and Wife of Noire (of the Fire Emblem Awakening message board)