Ah, good evening! How are you doing? I think you'll have better luck heading over to the Hacks Studio section in the forums, as the hacks there show instructions on how to patch and download your game for you to play in. Unfortuantely we don't deal with ROM Hack related questions here, so, if you want further help, I recommend you ask the moderators there! You can find the lick to the Hacks Studio section
here! Or specifically, you can find the gaia thread
here.
Hope you'll find what you're looking for, and again, if you have any questions, please don't hesitate to ask via private message! =)
*locks*