The last thre Gold Bolts in the game are in Veldin, Ratchets home planet. The first one is on the platform that has about 15 Elite Gaurds, it's behind the laser door, it's easy to get, just whip out the Taunter and lure the frog in there to step on the switch and the laser will die. The second Bolt is above that platform, when you get to the first Swingshot Ball in the level, look to the right for platforms, follow them to the Gold Bolt. The last one is just before the sewer tunnel, just before you get the swingshot out, look to the right for a Grind Rail path, use it and it will take you to the last Gold Bolt in the game.