I run a "DS Two" flash cart for each of my sons' DSi's. Since the DSi does away with the GBA port, that means the flash cart is the only way to run GBA games in any form.
As for MAME on DS, I don't know. I DO know that there is a MAME4ALL on PSP, so it would follow that portables of similar power should have a port running around somewhere.
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