Pokemon Sword and Shield – Delibird Max Raid event

A new Max Raid Battle is now available for players of Pokemon Sword and Shield. Delibird will be available to challenge in the Wild Area until December 25th 2019 at 23:59 UTC. The Delibird event will see players rewarded with Candy items. If you can’t seem to encounter this festive bird, be sure to update your Wild Area news in game.

Source