For Combusken, offensive moves do best. I suggest at least a fire and a fighting move and two other moves for coverage.
Poochyena...long term isn't the best and there are better dark types. Dustox isn't the best long term either and Zigzagoon...give it all the HM moves!
That's good to know. I'm really only about four hours into the game and have been using them mostly because I've had them the longest. I leveled up Poochenya because he was the one I had that was most effective against the girl in the first gym I had to beat.