Help a fellow Pokemon Trainer out (HeartGold/SoulSilver)

[Smashchu2]

Thanks for opening the thread. So here's the deal. I'm trying to add a 6th pokemon to my team, but I can't decide who. I have Croconaw, Flaaffy, Noctowl, Espion, and Growlith. I want a pokemon good in physical attack. Any suggestions?