Temtem is a massively multiplayer creature-collection adventure inspired by Pokémon. Seek adventure at the lovely Airborne Archipelago along your Temtem squad. Catch every Temtem, battle other tamers, customize your house, join a friend's adventure or explore the online living-world.
I'm surprised no one has mentioned this! It looks like a legit alternative to Pokémon for other platforms, although it will see a release on the Switch also.
The deluxe version of the game gives you access to the alpha in November. The game will enter early access on Steam in September 2019, and will release on all platforms in May 2020.