GBA / Gameboy Advance have come a long way. I've been able to play many games perfectly, even though there are several kinks. Find your free GBA emulator download here free today! Discover the following and more: VisualBoy Advance - BoycottAdvance - NO$GBA - BatGBA - DreamGBA - RascalBoy Advance.
Below, are a list of emulators by rank order. Ensure to research the emulator that you are using. Note also that some emulators allow the use of plugins. These plugins help speed up the emulator by producing better graphics and sound. Try all the emulators because even older ones may work better depending on your CPU configuration.