You need the Visibomb Gun and the O2 Mask: go where there are all of the small grenades falling down. Look up and search for a gold bolt on a sort of balcony with a funky wall behind it. Use the Visibomb Gun or the Devastator to blow that wall up. Then, use the former to direct your missile through the tunnel that appeared behind the wall. There will be four more walls to destroy. Then, once you have destroyed all 3 to 4 of them, go back to your ship and take the path you had to take when you had to catch the Infobot. At one point you had to turn right and to your left there was a closed opening with teeth around it (this is after the magnetic strip). You should be able to go through it now. Go to the end of the tunnel while avoiding the yellowish-green liquid everywhere and there will be the gold bolt.
You need the O2 Mask: as Ratchet, take the path you had to use as Clank and go along the path until you see the possibility to do wall jumps on the wall to the left. Just wall jump and the gold bolt is there. You have to finish the planet first before you can access the place.