This is a question I had for a long time and is, Do Romhacks also follow the first rule of the website?
ROM hacks that contain no copyrighted materials are completely legal. These usually come just with the edited files that you need to patch yourself. Either by patching the ROM itself or by way of layeredfs modding. Downloading the hack part is legal, downloading the ROM part is not. You need to provide that yourself.
ROMhacks that come included with the ROM part are therefore obviously piracy and illegal.
Oh okay, thanks for telling me