GBA4iOS
GBA4iOS is a Gameboy Advance Emulator based on gpSPhone. GBA4iOS can be installed by a button click and the best part is; no jailbreak required. I installed it earlier today and I just downloaded Pokemon Emerald to play on it. I am loving it so far and I recommend you try it out now!
1) Go HERE on your iDevice.
2) Click "Install App."
3) Follow the on-screen instructions and prompts.
(May take some time)
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4) After it's installed on your iDevice, open the app.
5) Click "Continue" if you see a popup.
6) Click the Magnifying Glass.
7) Click CoolRoms or find your favourite ROM site.
8) Find the ROM you want and click the download button.
9) Once downloaded, you'll see it in the menu. (Press and hold to rename file)
10) Click the ROM and play. :)
Features/New in 1.6
Quote:NEW IN VERSION 1.6 OF GBA4iOS
Toggle Speed! From the pause menu, you can now toggle between real game speed and extremely-fast-like-OMG speed, similar to the speed function in VisualBoyAdvance. (Only supported on iPhone 4S+, iPad 2+, and iPod Touch 5th Gen+)
128KB Saves. Upset that you can't save your progress in Pokemon Fire Red, or are you maybe tired of having just a white screen appear for certain games? Worry no longer, these ROMs are now 100% supported!
"Open In…" Support. Now if you're out and about and download a ROM in Safari, you can simply tap "Open In…", select GBA4iOS, and it'll import into the app for you!
No More Pull-To-Refresh. Now, the ROM selection screen will update automatically when you add a ROM through iTunes File Sharing, no need to manually refresh.
Other Features
Save State Support
Can import save states from other emulators (Name them the exact name of the ROM you want it to be a save state for, and append the number slot you want for the save. For example, if you wanted to import a save state in the first slot for “Pokemon Emerald.GBA”, you would rename your .svs file “Pokemon Emerald0.svs”, and drag it into the Documents directory via iTunes File Sharing.)
Portrait and Landscape Layouts
Customizable Frameskip
Gameboy Color ROMs (BETA)
iPhone 5 Support
iTunes File Sharing support
Works on non-jailbroken phones
FAST
Renaming ROMs. Tap and hold on a ROM, and you can rename it.
Auto save.