My Boy is a popular GBA emulator out there. It has high compatibility along with a laundry list of features. They include superior link cable support (over WiFi or Bluetooth), high game compatibility, fast forward and slow down modes, cheat codes, and hardware controller support.
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It also has some advanced features like OpenGL rendering, BIOS emulation (so you don’t need a BIOS file), and rumble emulation using your phone’s vibrate motor. It offers an almost complete experience and that’s impressive.