On planet Pokitaru, after you get the O2 mask go back to where the first driving machine the fat man used is supposed to be because it wouldn't be there anymore. Swim completely north until you see that there is a not so very tiny island with a big coconut tree. From there, go underwater until you see an underwater cave and go in. Keep going until you reach a surface. You'll see a bunch of platforms to climb on. Do it. At the top there is a lock that can only be opened using the thruster pack. If you slam the lock, a path will come up. Go. You'll have some enemies to kill and stuff to swing on (if you fall off the waterfall, you will die). Kill EVERYTHING and keep going until you reach an area where you can't jump up. Look above! A versa target! Swing up and you'll find a gold bolt.