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.
I had a lot of fun with Pokemon Xenoverse. I think it ticks a lot of your boxes.
I know you said you’re looking for something harder and more mature, but I cant help but recommend Pokémon Bushido, and Pokémon Xenoverse. Both excellent games imo.
Pokemon Eternity https://discord.gg/TZWNXrxK
More mature, traditional mmorpg style questing, real time battles against NPC’s, wild pokemon, and other trainers.
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If you want something familiar but also completely different, go with Pokemon Emerald Rogue. It does what it sounds like and turns the game into a roguelike.
my recommendation is Pokémon Unbound. really enjoyed my experience with that one!
Pokemon Theta Emerald Renev is one of my favourites. It’s basically Emerald, but with updated mechanics, attacks, and Pokemon, so you can have up to Gen 7 Pokemon in your team. The Pokemon list also means you can complete the Pokedex mostly on your own, and other cool features. Definitely recommend checking it out.