I came across a neat, large and well-made fan work,
the Mohavo region by tubz_az, featuring cool and convincing fanmade Pokémon, regional forms, characters and features as if for a hypothetical game (which the author isn't making). It is published primarily on Instagram:
https://www.instagram.com/tubz_az/.
A comprehensive collection of works of the Mohavo region can also be found here:
https://www.picoshots.com/tubz_az.
A few examples:
Region map, Sword/Shield style:
Starters:
Main Legendaries:

Seriously, this is brilliant. The artist's Pokémon look like the real deal, many are awesome and some are plain hilarious (cough, Mohavan Travolta Gallade, cough). It is one of the best fanmade regions I have ever seen. If you're interested in stuff like that, check it out.
(Moderators, feel free to move this thread to a more appropriate section if you can think of one; I couldn't so I put it here for now.)