Pokémon Uranium is a fan-made game created by ~JV~ and InvoluntaryTwitch over the course of 9 years. It takes place in the completely new Tandor region and features over 150 originally made Pokémon as well as a new type, Nuclear.
Download links can be obtained from their subreddit: https://teddit.pussthecat.org/r/pokemonuranium/comments/m9yvd6/download_links/
I guess not really official since the original one was made with RPG Maker XP not Godot Engine before taken down but probably a community effort to recreate it? Can’t really say much about the status because I’m not on (their) Discord server.