Pokemon TCG: TAG Team Generations Premium Collection - Rules of Play says:

It's so nice to see Pokémon from different regions getting along and working together! That's the focus of the Pokémon TCG: TAG TEAM Generations Premium Collection, which includes two foil promo cards featuring first partner Pokémon from the Kanto region teaming up with first partner Pokémon from Kalos and Unova. Both the Charizard & Braixen-GX and Venusaur & Snivy-GX cards will make fine additions to your Pokémon TCG collection. You'll even get an oversize Charizard & Braixen-GX card and a playmat that will help you play like a pro. There are even seven Pokémon TCG booster packs included in the set to boost your collection even further.