For weapon skills, I usually take my team to blasted lands. Right by the portal are the "servant of Razelikh" they don't die, they just go into an unhittable state, and don't attack you anymore while in that state. BUT your weapon swings count towards your gaining skill. It worked well on moving my huntards up in both polearm, and 2handed axe skills.

I'd recommend finding the fastest white weapon you can to gain skills tho. The 3.6 speed weapons take FOR EVARRR (it seems) to level up.