I agree that Empoleon has some key resistances (Dat Steel...), but if you're a freak like me, pick any water starter, but not Piplup OR Mudkip... That's because you can get them later, so yeah...
Of course, it's goign to take A WHILE to get Mudkip, AND A LONG ASS TIME to get Piplup, but you can still get them...
I don't recommend it, but if you want Piplup, go for it... I prefer Froakie, but whatever...