You have to download the original ROM and a patch file that the hack creator provide. Creators generally won’t provide you with the patched ROM though.
I think it’s called IPS patching. You can patch it online by googling ‘IPS patcher online’. Just download the original Pokemon Fire Red ROM and the rom hack patch file. Then upload to the online patcher site. You will get the patched ROM you can play.
You have to download the original ROM and a patch file that the hack creator provide. Creators generally won’t provide you with the patched ROM though. I think it’s called IPS patching. You can patch it online by googling ‘IPS patcher online’. Just download the original Pokemon Fire Red ROM and the rom hack patch file. Then upload to the online patcher site. You will get the patched ROM you can play.