Preferably one that’s not a rom hack, though I dig those too. I’m looking for something a bit harder than the originals and maybe a bit more mature, but still fair and whimsical. I’d like a game with pokemon from as many gens as possible, and fakemons are fine too.
Pokemon uranium is usually my go-to for non-rom fan games. It’s a bit more difficult than the main series games, but also packs a lot more content. Pokemon insurgence is another one that I’ve been trying lately. I haven’t gotten very far yet, but the gyms are pretty nice in that they no longer follow a single type, but rather a theme. As for rom hacks I can not recommend Renegade Platinum enough. It preserves the base game’s plot and general gameplay, but adds lots of small Creature comforts that truly enhance the overall experience (unlimited tm’s, legendary pokemon are much more accessible, the npc battle Ai has been improved for added difficulty, etc.).