Where can I find a West Sea form of Gastrodon?

I'm playing through Pokémon Sword and trying to fill up the pokédex. For completionist sake, I want to catch both forms of Gastrodon - The East Sea (blue/green) and The West Sea (pink/brown).

So far, I have encountered three locations where I can catch Shellos/Gastrodon, but I have only ever encountered the East Sea form.

Where can I find a West Sea form of Shellos/Gastrodon in Pokémon Sword? Are they version exclusive?


Solution 1:

According to Serebii, the West Sea form is not in the wild in these games and will only be available through Pokémon Home.