Why use GBA emu's when you can just get at slot-2 flash card like M3 Perfect Lite? I bought this flash card and I've never had any problems.....only game I've had problems with is Castlevania POR. You can see compatability and settings at teh following website,
> Never heard of the N-Card, so I wouldn't be able to say anything about its
> quality other than I would be inclined to think it would be a cheap knockoff.
> What I can tell you is that you won't be able to easily play gba roms on there.
> None of the slot1 cards can let you load gba games. Its a limitation of the DS
> hardware or some such, I think along the lines of how the gba couldn't use GB
> Color carts or something.
> You *can* still play gba roms, but you'll need to use a gba emulator that runs
> in DS mode. I haven't looked at any in a year or more, but last I saw they were
> still slow and buggy.
> A user review I found says the N-Card supports DLDI autopatching, so assuming
> that is true, you shouldn't have any issues with DS-native homebrew and would
> have full read and write support.