I agree with Uranium and Rejuvenation. They were enjoyable games. Uranium is pretty much done, minus the postgame. It's a pretty creative game imo. I cleared Rejuvenation up until the current ending, and it's been a great game, too. They're both easier than Reborn imo, idk if you're looking for crazy difficulty.
But to add a new suggestion, maybe take a look at Pokemon Clover. It's a FireRed hack made by some people on 4chan. It's a hilarious game with ingeniously-stupid writing (not at all immersive, but very entertaining), and the main quest is complete. They've been working on the postgame for a while, might be out soonish. It's 100% fakemon and 95% original music. It's also arguably hyper-offensive and anti-PC, so if you don't mind that, then definitely check it out imo. It isn't extremely difficult either, so it'll be a more laid back experience for you probably. Granted, it still won't be a set of free wins. I got stuck in a couple gyms, and if you're not prepared for the Elite Four, you'll wipe hard.
Also, if you play this game, DO NOT USE CHEATS. SERIOUSLY, DON'T EVER CHEAT. YOU'LL PAY FOR IT BIG TIME