The Pokémon Company have confirmed their plan for Pokémon Day, February 27th 2020. On this day, there will be many reveals:
First and foremost, a brand new Mythical Pokémon is to be revealed. This Pokémon will star in the new movie Coco and be available in Pokémon Sword & Shield
A special Max Raid Battle will run in Pokémon Sword & Shield
A special event will run in Pokémon GO
New information about Pokémon Masters will be revealed