GBA Card E Reader

[mattpfeil]

Ok, i just saw this in an add in the paper, can someone please explain to me exatly what it does, my girlfreind asked me yesterday and i felt stupid cause i didnt know:P
Thanks.

[Mayhem]

It plugs into your GBA. And then you can swipe cards through it. This can achieve a number of different things:

Play NES/G&W games on your GBA
Upload patterns/designs/features to Animal Crossing (using the link cable)
Information and games featuring Pokemon

And that's just the start...