@Dio_Vento has recently released his ROM hacks of Pokémon Sun and Pokémon Moon. Based on his previous work, Pokémon Rutile Ruby and Pokémon Star Sapphire, these hacks aim to provide a legitimate challenge to players seeking something more from the latest Pokémon games.
Here's the trailer:
Features include (but are not limited to):
- Harsher level curve
- New trainer & gym teams
- NPC's using Mega Evolution
- Improved item availability
- Trade-based evolutions can be done in-game
Downloads, as well as more information, can be found in the project thread.