Rock climbing is done in Hunza And Baltistan (coming soon). The best option for rock climbing in Pakistan is definitely The Trango Towers, the finest rock pinnacle in the world. It is located in the Baltoro Glacier, Baltistan. Keep your passport and visas and also get a permit before doing such a thing, you can be airlifted out of the area by Pakistani Air Force Helicopters (they take the money from you) from Siachen if you dont have the required documents.
Equipment: Normal rock climbing equipment. Not too Difficult. Bring camping equipment as well. No accomodation near these areas.