: Inclusion of Pokémon and evolutions from later generations.
It seems you're looking for the fan-made ROM hack, often shared via communities like Pokemoner. This project is a remake of the classic FireRed using the HeartGold/SoulSilver engine to provide a DS-style experience on the original Kanto map. Download Fire RedDS1d5 pokemonerdotcom zip
Since this is a ROM hack, you will generally download a or .xdelta patch file. To play, you must apply this patch to a clean HeartGold or SoulSilver ROM using a tool like ROM Patcher JS . If you need help with the following, let me know: Finding a specific patching tool . Technical troubleshooting if the zip file isn't opening. : Inclusion of Pokémon and evolutions from later