He has the skills to go higher, but likes breaking in newcomers with potential, so he stays where he is. His AC is designed to bring pain and sorrow on the weak.
PK is a middleweight reverse-joint AC equipped with dual machine gun weapon arms, a back radar, a small rocket launcher and an overboost core.
One of Werehounds greatest weapons (his arm machine guns) turns out to be his most fatal flaw. Since he doesn't have the ability to equip an Left arm unit, He can't attack if he runs out of ammo. Just avoid his weapon fire until he runs out then attack. Be careful though, just because he's out of ammo doesn't mean he won't try to dodge. Also try a stage with a lot of cover like the Old Dome of Murakumo.
He is probably the first real threat to a newcomer. His Machine Guns can quickly rip apart a target and his rockets are very powerful as long as you don't dodge. When he runs out, he can't do much but you still want to end this battle quickly just to be on the safe side.