The premier feature of Supernova Sun and Penumbra Moon is the ground-up redesign of Pokémon Trainers in the world to increase the game’s challenge. Like my Rutile Ruby & Star Sapphire hacks and my Nova Sun & Umbra Moon hacks, their main purpose is to provide a more challenging game experience while not artificially limiting the player.
Pokémon Supernova Sun and Penumbra Moon are mods for Pokémon Ultra Sun and Ultra Moon.