You can get a exclusive promo card of Pikachu from the Pokémon Mystery Dungeon: Rescue Team DX game. These will only be distributed at Geo (Stores that handle cards and games) and Geo Online Stores.
These will be availble from March 6, 2020, while supplies last of course.
You will need to spend at least 900 yen on Pokemon Card Game related product in order to receive this promo. You can only get 1 copy. It seems that only the game "Pokemon Mystery Dungeon Rescue Team DX" will be eligible for a promo card if you have purchased this at the Geo Online Store.