This isn't really a cheat and - Ratchet & Clank
This isn't really a cheat and is at the same time.
For a gold bolt on Orxon (pay attention this demands skill), if you have the Map-o-Matic it'll be way easier.
Go to the clearing where the pterodactyls keep chucking bombs on the ground.
There will be an acid pool with a sort of 'tongue' over it. Get a fair distance away from it (also in a spot safe from bombs or this won't work) and equip your Visibomb gun.
Steer the Visibombs up over the tongue and into the tunnel. Steer it till you reach a wall. Run into the wall with the bomb.
Keep on sending Visibombs down the tunnel, blowing up walls and stuff until you've deblocked the whole tunnel.
Go to the entrance at the other end, go all the way through the tunnel to the 'tongue' and collect your gold bolt!
By the way, to get the Map-o-matic, you have to go to the Gadgetron site and complete the grind challenge (you simply hit all the switches and dodge the obstacles).
Also, if any of you know, how do you input cheats? What part of the Goodies screen do I have to go to to input them? HELP!!!!