Why would you say that? I don't find anything particularly strange about Froslass.

[Now's around the time he'll be rubbing his hands in interest.]

Oh yes, Kato's spoken of you a few times. He has gained some rather...interesting Pokemon from you. [Yes, we'll go with "interesting."] But in terms of items, Metal Coats happen to be my favorite to work with. I'm honestly surprised that it only works on two species. It's such a useful concept to encase a creature in steel.