Because of the many cancelled Pokémon Card Game events in Japan for March (Corona virus), many players, Pokémon Card Gym stores and judges could not attend these kind of events.
To compensate these people, starting from April, Pokémon will give out special Pokémon Card Gym Promo cards.
Starting from April 3, 2020, players who come to a Pokémon Card Gym Store will receive a limited "Let's have fun. Spring, Pokemon Card Game." sticker.
Update 30-4-2020: Image added of the Pokemon Card Gym foil energy cards, releasing May 1. Thank you hearty_asahiya for sharing!
Update 30-5-2020: Added official images of the energy cards.
Along with this, if you spend 1500 yen or more on Pokemon Card Game-related items at Pokemon Card Gym stores and you can get one of these and you can get one of these special of Pokemon Card Gym stamped Marnie or Team Yell Grunt Promo cards (You can choose what card you want).
(This could be a teaser to the upcoming Marnie merchandise in the summer)
Starting from April 17, 2020, if you spend 1500 yen or more on Pokemon Card Game-related items at Pokemon Card Gym stores, you will receive one of these special of Pokemon Card Gym stamped TAG TEAM Supporter cards (randomly given).
Lastly, starting from May 1, 2020, if you spend 4500 yen or more on Pokemon Card Game-related items at Pokemon Card Gym stores, you will receive one set of limited nine basic energy types specially designed for Pokemon Card Gym (Foil effect and foil stamping).
All while supplies last.
(Also while these Sun & Moon cards have Sword & Shield promo numbering, the regulation mark is still equal to the Sun & Moon version, they will rotate out when the original card also rotates out in the future.)