When I went to the Leviathen's battleship I needed command codes from the Vallhalla but I dont know where thy are?

This is where the game's item collection quest starts. This is the equavalent of getting the Artifacts in Prime 1 and the Sky Temple Keys in Prime 2. This time you need Energy Cells. To get the part where you are in the game, you would have to have at the bare minimum two energy cells. Go to your inventory, and go to Energy Cells. See how many you have. If you get the one on the floor in the Valhalla docking bay (near the crashed fighter) then you have three. If you use the glitch, you can reach the Command Code. Use your first cell on the first door in the docking bay. Swing across the gap and shoot the corpses blocking the Hand Scanner and the door. Use the hand scanner and go through. Kill the Phazon Metroids in the next room with the X Ray Visor+Nova Beam combo and ignore the Miniroids. go straight and to the left past the electricity and onto a ramp. Use the platforms to scale the room and reach the top. go through the door. i dont remember where you turn at this junction, but if you ever come across a place requiring TWO energy cells, DONT USE A SINGLE ONE because those areas only lead to upgrades you dont even need. Find an elevator room and use your second cell there. Go up and through the door. Once you reach a hallway with a few Phazon Metroids, turn immediatly right and use your last cell to unlock the blue door. Continue on from there past a Green Door. Soon you'll be in the Aurora Chamber. There are two Energy Cell slots here. Ignore them. Go up the first ramp onto the platform and turn right around towards the direction of the cell slots. look up. back up a bit if you need to, but you should see a blue door on a ledge above with a raised bridge. Try to Space Jump to the left a bit and Screw Attack into the bottom of the raised bridge. make sure that you end up falling into the abyss (the reason why you need to jump left a bit is to make sure you fall down). if you do this correctly, you will respawn on the ledge with the raised bridge and the blue door (this may take a few tries). continue through the door, turn right, use the Grapple Voltage and then after use the X-Ray Visor. Use the terminal and you will gain the Command Code. go back to your ship and continue back to the Leviathan Battleship.