Froakie. Final evolution should have a brawler or ninja motif, Water/Fighting. High speed, lower defense and average HP, similarly decent attack stats while leaning towards special attack. Desired moves include Aura Sphere, Close Combat and Nasty Plot, either by level up or breeding.
so basicly you want a water version of lucario --- "when I'm in the process of doing something, I do it not because I think it's worth doing, but because I'm trying to MAKE it worth doing."