Pokémon has announced that there will be a new Max Raid Battle event featuring the a special Milcery that can Gigantamax when in evolves into Alcremie. The event will run from January 30th to February 16th.
During this event Milcery will appear more often in Max Raid Battles in Pokémon Sword Version and Pokémon Shield Version. Upon catching or defeating this Milcery there is a chance the player will get special evolution items for Milcery, Star Sweets or Ribbon Sweets. These sweets were previously unobtainable in the games and using them Milcery will evolve into special flavors of Alcermie.