ok i dont know if this had been said before, this is sorda a suggestion........ok if those new gba flash linkers can support up to or over 1 gb....could you just download a rom for a gamecube game, put it in the gameboy player(im assuming it plays the roms), and then play the game off of that? im sorry if i have irritated anyone if this has already been stated...
1Mb = 1000/8MB also gameboy player is not just and interface, it has alot of the GBA hardware. I still wonder if you couldnt use multiplayer port with the USB cable to do something.
you could try but the cartrage would have to be written in a rom format in order for the gba player to see the ilegal game