I was asked this today by my friend, who is a shopkeeper, as noone who works there could answer!!! Someone wanted to buy the Pokemon GBA game that comes with a wireless adapter. What they wanted to know is - is it possible to use one copy on a GBA with the adapter, and another copy on a DS? Is the DS wireless compatible with GBA wireless? I believe that there is no compatability for DS to DS via wireless for (non-wireless) GBA games - is this true? Shame if so... that would've been a nice implementation! I guess the same would be true of wireless to wireless on GBA for non-wireless games. And of course, there is no port on DS for a GBA link cable!! Or is there a way to link a DS to a GBA?
Nope, there is no way to link DS's in GBA games, in any way. It's a shame really as you say, but at least the DS's implementation is WiFi, so you can do internet play.
nope wont work since they use different signals, thus why that adaptore goes on a gbas expansion port. Will in no way work on ds, thus this is why some say that it might be best to still have an sp as you can play multiplayer on it.