The celebration kicked off yesterday with a number of events in the free-to-play mobile game Pokémon Masters EX, including the Villain Event Spreading Shadows where you can boost Giovanni and Mewtwo and the Extreme Battle Event Giovanni's Malice that lets you fight Giovanni. Full details for this event can be found here, although Nintendo Everything has also translated the full list of events into English.
Today, Pokémon Sword & Shield has a new Max Raid Battle event featuring Gigantamax versions of the three Kanto starters, Charizard, Blastoise, and Venusaur. You can also get Max Mushrooms as an additional reward for beating them. The event will run until February 27, 2022 at 3:59 PM PT / 6:59 PM ET.
We will see more events and announcements throughout the rest of the week, with each day being dedicated to a different games. The schedule is as follows:
February 23: Pokémon Café Mix
February 24: Pokémon Unite
February 25: P25 Music
February 26: Pokémon GO
February 27: Pokémon Day
While not directly related to Pokémon Day, it's also worth noting that the 1.2.0 patch of Pokémon Brilliant Diamond & Shining Pearl also released today, adding more functions to Union Rooms and the Colosseum, while also fixing general issues. The patch notes can be seen below:
Ver. 1.2.0 (Released February 21, 2022)
Union Room functions have been expanded.
The maximum number of players you can play with via local or internet communication in Union Rooms has been increased to eight. Also, by selecting Greeting or Capsule Decorations, you can show each other your Trainer Cards or Capsule Decorations.Additional Colosseum battle feature has been added.
Enter the Colosseum on the 2nd floor of a Pokémon Center to battle with other players using custom rulesets.In the Colosseum, you can set rules, such as the number of Pokémon to send into battle as well as their levels, and play Single Battles, Double Battles, or Multi Battles via local or internet communication.Pokémon Trading and Battles
Some Pokémon acquired via unintended methods or illicit modification now cannot be used in Link Trades or Link Battles.Fixed some issues for more pleasant gameplay.