Just curious though. I only tried the tutorial and it worked on Boycott Advance.

But I don't think we'll will move more than the emulators. I mean, how do you upload your game to a chip for the gba.

You can buy devices that put games onto (things that work as) gba carts. However, I don't know if any have mac drivers, and in addition they're (said to be) mostly used for piracy, so I don't know where would sell them.

I have a feeling you can get carts containing more than one game, but they're probably fairly dodgy as well.