Ratchet and Clank: Up Your Arsenal Hints

First you buy the holoshield glove from a gadgetron vendor for 30,000 bolts, then go to daxx. Take the path that leads to the charge boots (the one behind your ship that has all the bugs) kill all the bugs and a big robot with gattlings should appear, then put on your holoshield glove then, just let him keep shooting at the shield until it turns red, then repeat the process until your holoshield glove reaches lvl 5 and is an ultrashield launcher.

In the last boss fight keep attacking him until he gives up and tricks you. go to the bridge with many robots on it use sniper rifle on the last boss nefarius while on the bridge and the game will hang (sorry I dont know the weapon because I dont play it anymore)