How do you make yourself invisible on ratchet and clank 3 on PS2?

NO.so far there is no r&c game which you can fly without the use of tools or gadgets or vehicles.

you need to get all of the trophies

First, go to Holostar Studios. Then work your way to the Hacker point where the elevator comes down. Go up the elevator, and there is a ledge on the left. Get on that ledge, and you'll find the Clank...

they are very well hidden try to find a site that tells you exactily where they are but ya they are very well hidden on almost every level 1 per level most levels that is they are in holostars...

You should be given the Hologuise, after beating the test bots in a hoverboard race at Planet Kalebo III