The best alternatives to Pokémon Uranium are Pokédex, Pokemon Sword, and allpokemon. If these 3 options don't work for you, we've listed a few more alternatives below.
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Pokédex is a marketplace that lists 1 rare Pokémon card for sale each day. Cards span Base Set all the way through Battle Styles. Plus, every Saturday and Sunday we give one lucky winner a freebie that spans boxes, cards, and packs dating back to 1996.
(Only desktop for the moment) PokeGuess is a side project that helped learn javascript, is connected to the PokeAPI, big thanks to them for their great job. It's a fun game based on the Pokemon show. Can you guess all the Pokemons? All of them are from the first generation <3