I don’t know if anyone has issue with some GBA games on gPSP standalone emulator (I don’t like RetroArch because of its battery and CPU consumption). I had a blank white screen when starting some Pokemon games (FireRed, Ruby).
Googling around and found that gPSP requires special configurations for some specific games to run correctly.
Copying game_config.txt file from Github repo in gpSP for gameshell alone build to /home/cpi/apps/emulators will resolve this. 
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