yes here is the deal
top left SD card (stores games)
top right supercard (slot 2 GBA)
bottom left Pass Device (slot 1 DS)
bottom right, ummmm comeon DS lol
this is all old stuff BTW
ok so info goes on SD card, read by slot 2 device, excecuted through slot 1 device (so you can run non nintendo code) also allows GBA code to run
youll want for GBA a supercard (or whatever) slot2 device that fits with out sticking out of the bottom of a DS lite
and a Pass Device of some sort
i recomend SuperCard MicroSD Lite Rumble
hereand a PassMe3 or SuperKay
hereand of course youll need to grab a microSD card, i estimate all this will run you with shipping from the same place about $100
and you can do everything with that (cept run linux)
EDIT Supercard DS Lite Rumble does not allow GBA to run, my bad, as far as the Lite NO rumble, that should work fine also good deal
here