Ratchet and Clank Cheats :
This is how you get the Golden Weapons. After you beat Drek the last time it will say Do you want to time warp to before you defeated Drek or Start a new game with all of your current bolts and weapons. Chose Start a new game with all of your current bolts and weapons .. .... .
Once you get to the first planet (besides Ratchets home planet) you will see a teleporter that takes you to a room where you can buy Golden Weapons. Every weapon costs 4 gold bolts and a number of regular bolts between 10,000 and 60,000. A Golden Weapon is a weapon that is an improved version of previous weapons.