The Pokémon Company and Nintendo are continuing to host various distribution events for Pokémon Sword and Shield. The Pokémon Company has announced a Milcery distribution event for Pokémon Sword and Shield in Japan, where players can visit actual Pokémon Center locations during their birth month to receive a serial code to unlock the Pokémon in their game. This Milcery will come with the Ribbon Sweet or Star Sweet items. This distribution event will officially begin in November 2020.
Source: The Pokémon Company