I've been playing my way through and enjoying Pokemon Unbound, one of the most amazing Pokemon rom hacks to have been created. It's a rom hack with a custom region, custom story, and amazing customization in settings. It even manages to have a difficult mode that is challenging without being grindy bullshit.

I'm doing a "soft nuzlocke" of the game, where I can only capture one Pokemon a route, and my Pokemon don't die- instead, when I wipe, the entire run ends. It's a lot more forgiving and fun way to play Pokemon while making it a little bit more challenging. Would recommend trying any Pokemon game this way, and would especially recommend Pokemon Unbound whether you're a casual or experienced Pokemon player.