It depends on how much you want to spend. If you want to go cheap route the acecard 2i with AKAIO is your best option. The acecard 2i has great Compatibility and support but doesn't have alot of bells and whistles. But if want to spend more i recommend the cyclods or supercard dstwo. The cyclods has great compatibility and support while also having RTS, slow motion and such while the supercard dstwo has that plus a buillt in gba emulator and soon a snes emulator and more. Hope that helps.
Also, http://gbatemp.net one of the best GBA/DS sites out there
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