The Pokémon Company recently revealed another special distribution for Pokémon Sword and Shield players. The Galarica Wreath item was initially scheduled to be distributed via a special shared serial code that was supposed to be shown during the Korean Crown Tournament Finals livestream on December 19 and December 20. However, this tournament has been postponed due to COVID-19 and will now be held on February 6, 2021. The stream will be made available in Korean, but all Pokémon Sword and Shield players will be able to use it to unlock the item in their game.
Source: Pokémon Korea