/vr/ - Retro Games

>>7763127
no$gba is the one I always used. Its pretty high up there in terms of debugging emulators, at least among ones I've used.

If you want to do something a bit more involved, you might also want to look into using a disassembler. Better yet, many of them support decompilation for the GBA's processor, making the whole process much easier (in my opinion). Just to give you an idea: using a decompiler, I was able to extract maps from games like F-Zero: Maximum Velocity while knowing practically zero ARM assembly.