It's been a while since I've been back here! Anyways I haven't seen a topic about this, but if there is then forgive me please. Recently I came across a nds emulator for iDevices. You don't have to be jailbroken to get it, but it makes the installation process easier. The name of it is nds4ios, I'm not sure if we're allowed to post external links so you can just google it. It runs (5097) Fire Emblem: Heroes of Shadow and Light pretty well at 40 fps. So yeah just post here if you want screenshots.
Somehow, I don't see that happening. Apple have very strict regulations on what can go on that store.