So these are modified gbc roms made by fans? if yes where can I get these roms?Yup. That's what this is all about, taking what Nintendo did with the official Pokemon RBY 3DS VC titles that allowed for wireless battling and linking and making it work with Gold, Silver, and Crystal. It was found to not be the easiest of tasks, however, they've managed to get it done, and that I think is something that should be applauded haha.