How do I unlock rank 4 parts for the Gundam Epyon?
Unlock and clear the “Zero vs. Epyon” Extra Mission. To unlock the mission, you must first receive the “Sanc Kingdom” terminal message from Relena (which is sent as soon as you max out your relationship with her). You cannot get this message while playing as either Heero or Milliardo, so you must use another character. To play “Zero vs. Epyon”, you also must shoot down 3000 or more enemy units while playing as Milliardo. Note that “Zero vs. Epyon” is playable for Milliardo only, is restricted to one-player only, and requires that you pilot the Wing Gundam Zero.
