Interesting pokemon. Has great HP and physical defense making it a great tank. But saddly its high offensive stat is attack making it only know waterfall and aqua jet as attack moves (maybe double slap and return if your crazy).
Also it gets WISH. This makes Mamabou one of the first physically defensive pokemon to be a wish passer. Although vaporeon mainly beats it out in OU that doesn't mean that it won't most likely appear in a UU near you.