You say you used to do ROM hacking? Why were they never good enough? Me, I'm not so much a scripter, but I could map an entire world easily. The problem for me is all the interior areas, like houses; I tend to overlook something on the completeness side. LMAO
I actually have a story idea in my head I kinda want to put together. I'm helping with some difficulty leveling and minimal map creation on a hack right now (Route 1 needed a makeover in short terms), so once the mapping part is done I'll be rewatching the anime for some storyline ideas again (can you tell it will involve Team Rocket?). If you might be able to do scripting, you could still have a chance to hack.