You must get the Tianna Key for the the locked door in the Tianna Camp. Next, go to the locked door and open it. Inside you will go up against a Boss, accompanied by two Belladonnas. Beat everyone, and after the fight break the red crystal to get X's Ultimate Armor Hyper Mode.

After you beat the Melda Ore Plant send ask Nana to call the deployment center and send a team there and obtain the Melda Key afterwards return to the Melda Ore Plant and go through the locked door and defeat Duckbill Mole and break the crystal and get Absolute Zero.