how many tag team pokemon cards are there The New Gimmick: Pokémon embrace the overflowing power of Mega Gardevoir ex type:pokemon is:tag-team - Card Search

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According to Bulbapedia: In Japan, this card was given to participants of the 20th Anniversary Festa, held at Toki Messe, Niigata on October 10, 2016 and at the Nagoya Trade & Industry Center, Nagoya on October 23, 2016. From nintendowire.com: A special edition Pikachu full art card will also be given out to those competing in the tournament which features all three Kanto starters and the 20th Anniversary logo! It seems like there were separate card prizes for the winners consist of special Trainer cards featuring gold, silver and bronze rings, so it seems the 279 XY-P was a participation card that all the competitors received

...and this synergy as well

For example, the Professors Research card allows you to draw two additional cards on your turn whilst a Gym Leader card, such as Sabrina, allows you to swap out your opponents active Pokmon for one on their bench