NDS emulator for ios non-jailbroken?

I have an iPhone 4 that's not jailbroken and I want a nds emulator. I have a gameboy emulator that I got in emu4ios. There's was an emulator for both but whenever I would install one after another one of the emulators would get over written so I only had access to one of them. So how do I get a Nintendo ds emulator without jail breaking?

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