Ratchet and Clank: Up Your Arsenal Cheats

Go to Tyronosis and get to the plain. Hop in the car and crash into all
the flower thingies and for every group you destroy, you get about 300
bolts. Then, let the monkey dude kill all the teranoids(works best after
bioblitziater attack). You get about 50 every teranoid. Then head to the
base and kill all the robo-noids and noids and break all boxes to get
about 5000 bolts or more. Also, on the right side of the base is a
titanium bolt to buy skins with.

Every weapon in the game changes its name when you upgrade it to level 5:

Need easy stages to get weapon experience? Play the Annihilation Nation challene against Scorpio to rack up the XP. Some weapons, like the shield glove, may need different stages to gain XP. For the shield glove, try playing the battle missions in Marcadia and having the bevy of peons shoot your shield for XP.

Get a certain number of skill points to unlock each of the cheats:

Effect - Code