http://www.idownloadblog.com/2011/04/26/how-to-run-ipad-apps-on-the-iphone/It's an iPhone app, but it's only meant for devices with 1/2 GB of RAMConverting an iPad app into an iPhone/Pod Touch app is virtually impossible without the source code.
You're probably better off porting Desmume to iOS.
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Impossible to port.
And, my post was meant to correct you, it runs perfectly on the 4S from the App Store.