Galarian Meowth and Galarian Perrserker from the Zacian & Zamazenta Box have been revealed to be included exclusively in this product. This box will release officially tomorrow in Japan on Friday December 27, 2019.
Translation by ToineLay (thank you!):
Once per turn you may discard 2 cards from your hand. If you do, add a Galarian Purrzerker from your deck to your hand.
Update: Galarian Perrzerker added
It seems to do flip 3 coins, if heads it does 80 damage per heads (translation pending).