Hidden stuff
If you insert any Megaman Battlenetwork game(except for battlenetwork 6) there is hidden items unlocked. Most noticable is if you put in any of the games execpt for the battlenetwork 5 games, during virus battles, the music changes from the usual to a theme off that game that is insterted. Also you can get cheap Subchips from inserting battlenetwork 2, and get some programs at a navi in one of the end areas, and the cheap subchips are at Lan's fathers room in Scilab which are half price. That is the ones I've found so far besides the advance list on the boards from inserting battlenetwork 4: red sun/blue moon.
More tricks, tips and cheats for this game are right here - Mega Man Battle Network 5: Double Team cheats
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