I've thought up a few fakemon, though the most of the concepts probably aren't great. I'm thinking up the story in bits and pieces, most of which is done at school lol, I'm going to try and make a really thick plot, though.
I think i got my first glimpse of Dioptase at a seashell/crystal store in main.
I probably would have ended up hacking at first, since it's more widespread, but I found the Game Dev section and was instantly amazed.
Anyhow, best of luck with your game.