Thanks for this guide, @nouty . A superb amount of effort has gone into this, and this linux newbie (me) has been able to set up plenty of emulators with your advice and a bit of patience.
a question for all in the topic: is there an Neo Geo Pocket Colour core available? I can only find the original monochrome core currently.
edit: Its alright, I figured it out. I put zipped files in the ROM folder, and they weren’t recognised, but unzipped them and they appeared in the game list and could be played.