GBA emulator

GBA Emulator really only has two main emulators that are nearly perfect. NO$GBA is a very popular GBA emulator, that is also a NDS emulator. VBA – VisualBoy Advance is by far the best and most popular GBA emulator. VBA does much more than only GB Advance emulation. With it you can play GB and GBC roms as well as games made for GB Pocket, Super GB and all the games compatibl with GBASP. I don’t know how popular GB pocket is, but you may find it useful for a GBA emulator. NO$GBA is not an emulator to be overlooked either.

Nintendo Gameboy Advance emulators

Visual Boy Advance
Easily the best Gameboy / Gameboy Advance emulator available..
Boycott Advance
Average Gameboy / Gameboy Advance emulator available..
Very complete Gameboy Advance emulator. Also emulates the Nintendo DS.
Gameboy Advance Emulator.
Rascalboy Advance
Gameboy Advance Emulator.
Gameboy Advance Emulator.