The official Pokémon website has announced that from December 20th, 2019 until December 26th, 2019, players of Pokémon Sword and Pokémon Shield can conduct more Max Raid Battles against Delibird in Pokémon Dens all around the Wild Area. If players defeat Delibird, the rewards are better than usual with more Ice-type TRs and Exp as well as Candies.

Delibird Max Raid Battle Event Hits Pokémon Sword and Pokémon Shield for a Limited Time

’Tis the season for awesome Max Raid Battles against the Delivery Pokémon, Delibird.

Delibird is spreading holiday cheer in Pokémon Sword and Pokémon Shield. For a limited time, you can conduct more Max Raid Battles against Delibird in Pokémon Dens all around the Wild Area. The rewards you'll earn for each Delibird you defeat will be better than usual, with more Ice-type TRs and Exp. Candies among the goodies.

To take advantage of these limited-time Max Raid Battle bonuses, you'll need to connect your Nintendo Switch system to the internet. Then, when you see a pillar of light shining from a Pokémon Den in the Wild Area, you can walk up to the Pokémon Den and interact with it to start a Max Raid Battle with a Dynamax Pokémon.

Your chances of encountering more Delibird in Pokémon Dens will last only from December 20 through December 26, so grab some friends and head to the Wild Area today.

Source: https://www.pokemon.com/us/pokemon-news/delibird-max-raid-battle-event-hits-pokemon-sword-and-pokemon-shield-for-a-limited-time/