Well, here are the in-breedables :
Magby, Elekid, Cleffa, Igglybuff, Pichu, Wynaut (very important for Wobuff' since this is the only way for him to get Encore and ensure a hit, helped a lot in the Uber !), Bonsly, Mime Jr., Riolu (of course), Mantyke.
All from memory ! :O I still think I forgot some tho' ! (: