Back in the GBA era of Rockman games. There was a special feature only for the original Japanese versions of the games. Excluding Card e-Reader+ functionality, you could actually use a Rockman EXE Axess Battle Chip Gate to unlock certain Minigames as an alternative. This is good especially for the player that isn't too good at these types of games, or just wants to save some time with less playthroughs of the game.
Keep in mind, I've tested the localized copy of this game and I can definitely say it does not work. This only for the original game, I'm also sure there's more Battle Chips out there that could work with it. I honestly don't feel like taking out all my chips to test each minigame with it. Below are some of the ones I've used for my results. I may update the listing at a later time if I have anymore of an interest. Oh, and I already submitted this to GameFAQs. Thanks.
Minigame | Battle Chip |
Fernir | MeteorRedSun |
Leviathan | Counter2 BlueMoonRay |
Harpuia | MeteorRedSun & BlueMoonRay |
Phantom | MeteorRedSun & BlueMoonRay |