This summer, let's play the Pokémon Card Game! The 2021 Summer PokéCard Campaign will start on Wednesday, July 21st, 2021. Let the Pokémon Company know how you've been playing the Pokémon Card Game with your family and friends! They'll be giving away a set of three special art promo cards, Booster VMAX 186/S-P, Showers VMAX 187/S-P, and Thunders VMAX 188/S-P, to 3,000 lucky winners!

Campaign Details:

Time Period: Wednesday, July 21st, 2021 until Thursday, September 30th, 2021
How to apply: Please fill out the application form that will be available on this page on Wednesday, July 21st, 2021. Register your Pokémon Card Game Player ID (only for those who do not have an ID). If you don't have a Pokémon Card Game Player ID, please register at the Pokémon Card Game Players Club (https://event.pokemon-card.com).
Prizes: 3,000 winners will receive 1 special art promo card set featuring Booster VMAX, Showers VMAX, and Thunders VMAX.

Source: https://www.pokemon-card.com/info/2021/20210702_002999.html