Bass cross Megaman battle network 5

yeah, but it depends on if you have the normal Battle Network 5 for the GBA or Double Team DS, if you have Double Team ds you must also have a copy of Battle Network 5 Team Colonel for the Silver Casscross or team Protoman for the Golden Basscross, first you must completely finish the game for the GBA (all soul unions and chips) then you must battle Bass in Oran Area if I remembered it good (search on youtube where exactly) after doing that on the GBA double slot it with Double Team DS, it'll say detected megaman battle network 5 team colonel/protoman want to start basscross game?
oh remember one thing: your copy of team protoman or colonel MUST BE the same region as your copy of double team DS