Though it does not cater to a great user interface, still it is easy and quick to set up and use. If you have computers of ages and wish to play NDS games, the Duos emulator is the apt one.
NDS4iOS is one of the popular Nintendo Ds emulator iOS, but it does not let you install it from the app store instead, you should rely on a third-party source as few other emulators do.
We have discussed the necessity/importance of DS emulators to play classic Nintendo games, in our previous blogs.