In the Team of Blues release, the Japanese version of Team ProtoMan, there exists a menu for using the Wireless Adapter, rather than the Link Cable, for multiplayer play. It's possible to access this menu through the use of hacking tools, although the feature is not actually programmed. Both the ProtoMan and Colonel versions can use the Wireless Adapter for the Crossover Battle with Boktai 2, so it's unknown why this feature was dropped from the main multiplayer section of the game.
Contributed by SonicManEXE
Attachment
Attachment