To unlock the hidden Navis, you must have a completed EXE 4 (Red Sun or Blue Moon) save file with the following achievements:
: A chime will play, and your library will now display all chip icons, which normally only appeared if you slotted in the real-life toy versions of those chips. The Rockman EXE Zone Beginner's Guide to Real Operation rockman exe 4.5 real operation title key