Actually it has a lot to do with emulation even if it's just emulating DS games on the DS itself without the original game(s).
I've started to look into it myself based on what a friend of mine told me. All you need is a MiniSD card with a USB adapter to upload the games to then I think find blank DS game cartridges to fit the MiniSD card onto then play away.
Though finding the MiniSD and USB adapter is fairly easy I was wondering where to find the blank DS cartridges?
