: You will need a clean Pokémon Sapphire (USA) GBA ROM.
: Search specifically for the Moemon Sapphire page on Pokemoner . This site acts as a repository for various fan-made Pokémon ROM hacks. Download Moemon Sapphire April212018 pokemonerdotcom zip
Did you get a file or a patch file (.ips) inside the zip? : You will need a clean Pokémon Sapphire (USA) GBA ROM