If anything it should be Monferno vs. Piplup, since Chimchar evolves at level 14. Anyway, Prinplup would win, But, I still like Chimchar the most. And like Vareth said, One Close Combat from Infernape OHKO's Empoleon.
Should it really be Prinplup or Piplup? Anyway, Piplup line still wins. Empoleon would definitely beat Infernape.... plus.. Empoleon is also my most favorite water pokemon!
Infernape might be able to win against Empoleon, because it does have more speed, so with a strong attack like Close Combat or something, it could almost hope for a OHKO. But if it dosent, Empoleon will kill the next turn =P
I think there is a problem torterra use earthquake and do a ko to infernape or empeleon.if Infernape do a close combat do a ko to torterra and empeleon and empeleon do a drill peck or hydro pump to do ko to infernape or torterra.