I IN NO WAY SUPPORT PIRACY FOR THIS. YOU SHOULD OWN THE GAME BEFORE GETTING A ROM FOR IT, OR DO A BACKUP.GBA4iOS was originally a GBA emulator that did not require a jailbreak to use (1.6.2). However, it's back, and a whole lot better, for iOS 7.
Features include:
iOS 7 Layout
iPad Support
GBC Support
Cheats
iOS 7 Controller Support
Event Distribution
Dropbox Sync
Custom Skins (for controller, portrait and landscape)
Sustain Button
It also has other things like a vibration for button presses, AirPlay second screen use, ability to use music/external audio, and frame skip.
How to install:
Visit
http://gba4iosapp.com/download/ on your iPhone.iOS 7 users: Download 2.0.1.
iOS 6 and under users: Download 1.6.2.
It will ask you if a site can download GBA4iOS. Say yes/click install.
Once it finishes downloading or installing,
DO NOT LAUNCH THE APP. Go into your system settings, general, and date and time. Disable automatic date & time and set the date before Feburary 19th.
You can launch the app, and if performed correctly, it'll launch. To add ROMs, click the plus sign. Settings are also available for changing with the gear.
You can set your date and time back (automatic), however if you reboot your device or it restarts, you'll have to set the date and time back to before Feburary 19th and do it again. Your ROMs and everything else will stay though.
So yeah, it's a really good emulator, devs are great. Like I said, I don't support piracy. I'm only talking about a emulator/emulation, not piracy.