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Yes.

(Download GBA4iOS Source code, compile using XCode 7, install on device.)
 
If you jailbreak then you can and always have been able to use a GBA emulator.

If you don't jailbreak then you never could and never will be able to use a GBA emulator.
 
If you jailbreak then you can and always have been able to use a GBA emulator.

If you don't jailbreak then you never could and never will be able to use a GBA emulator.
Well you could get xcode 7 and side load a particular GBA emulator that was available online for any device, jail broken or not, until 8.1 killed it.
 
You can go to this site, all you have to do is pay a fee of $9.99 for a year and you can get access to the GBA emulator and GB emulator. http://builds.io/
just go to it in your iPhones Safari not in private browsing and you can download it. Its working on my iPhone 6+ on iOS 9 beta 2. And you DO NOT have to Jailbreak.

Good luck and happy gaming.
 
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