Galarian Farfetch'd is appearing in Pokemon Go to celebrate Pokemon Sword and Shield expansion. The Galarian Farfetch'd will be available for the first time around the world. Ordinary Farfetch'd is only available in Asia, so this will be the first chance for many players to catch the regional Pokemon. Its appearance in the game might be short-lived as they are only scheduled to have an increased spawn rate for about a day.
Galarian Farfetch'd Pokemon GO: How to Catch
Since the Galarian Ferfetch'd became available to celebrate the release of the Pokemon Sword and Shield expansion, they might not be available in normal gameplay once it's over. The release of Galarian Farfetch'd with increased spawn rate is different than a Community Day because there are no special moves available and no increased chance of shiny Pokemon.
The release of Galarian Farfetch'd also brought new cosmetics to match. The Farfetch'd themed items will only be available for a short time, but other Pokemon Sword and Shield cosmetics like the "Isle of Armor" set will be available in the Pokemon Go shop for much longer.