Yeah, you can find Quartz and Chaos Black and all that jazz on the internet. The weirdest hack was Jade, a Gameboy Colour game where you're playing baseball one day. You get transported into another world where Pocket Monsters live in their own little villages and such. The battle system was hilarious, you have to phone your Pokemon to get them to battle for you.
Weird stuff, the hack should be floating around somewhere on the internets.
PART EDITED OUT
EDIT: Sorry, I didn't notice there were ROM links on the site. Guess I've broken my clean record now aha...