I don't really know any off the top of my head, I think Eclipse has some Megas in it but I'm not sure if that's in the current release yet; either way it's worth playing the hack because it's very fun. In the mean time I'd recommend posting in the Hack Recommendations Thread in the ROM Hacking Hub to see if any of the other users on PC can help you out.
Glad you enjoyed Gaia, and I hope I helped a little here, haha.
Glad you enjoyed Gaia, and I hope I helped a little here, haha.