Trade moonstones for Hypnomatic Part is a mission in Going Commando taking place in the Tundor Wastes, Grelbin. After the Mystic moved the rock when Ratchet and Clank brought him nine moonstones, he offered them a part of the Hypnomatic for sixteen moonstones.
This mission is a continuation of the previous mission. As you can only obtain five more moonstones on the lower portion of the ice field, you need to create a bridge up to the upper portion, which can be done by completing the mission "Explore the caves". After this, you need to obtain a minimum of eleven more moonstones on the upper portion to gain a total of sixteen.
As with before, the enemies fought here are extremely durable and deal a lot of damage. The Y.E.T.I.s are both durable and numerous, and can easily overwhelm you in melee range, while the arctic leviathans can tank and deal a lot of damage. As with before, your weapons of choice will be the Minirocket Tube, Hoverbomb Gun, Plasma Coil, and the Bouncer. Use this as an opportunity to upgrade any of those that are outstanding, but once they are upgraded they will prove more useful against the enemies here, due to the improved area of effect.
Due to their durability, you will run out of ammo very quickly. It is often faster to simply drop in the ice pools and respawn to get back to the Megacorp vendor and restock on ammo than to use the Charge Boots all the way back.
Once you have obtained enough moonstones, return to the Mystic for the Hypnomatic part. At this stage, you cannot complete the mission "Find Angela" until you obtain the full Hypnomatic from the mission "Bring Hypnomatic parts to Hypnotist" on Damosel. Consider finding more moonstones for 3,000 bolts each, but you do not need to find them all at once; obtaining the Mapper from the mission "Explore the moon" on Damosel will make the process significantly easier.