CrocoDS is a port of my Nintedo DS emulator for iPad/iPhone/iPod.
It’s heavily based on WinCPC by Ludovic Deplanque.
A lot of work has been done to make it usable on Nintendo DS 6 years ago.
When I begin to develop on iPhone, it was the second application I do (The first is Doobs).
It contains thus a lot of bad iOS coding 
CrocoDS is available on GitHub at https://github.com/redbug26/crocods