I don't understand what you mean.
Do you want something to run backups of games?
If so, I'd check out the MK4 from www.neoflash.com. YOU NEED A GBA FLASH CART TO GET IT TO WORK. There aren't any cards just for ds yet. All of them so far use the GBA slot.
I suggest you go
here for some info. Some of their data is a little outdated, but the general idea of how to run games on a DS is still there.