Pokemon TCG: Sun & Moon Cosmic Eclipse Theme Deck - Rules of Play says:

A supreme connection of stars and Pokémon! At the apex of the sun & Moon Series, the Pokémon TCG: Sun & moon—cosmic Eclipse expansion boosts the connection of Pokémon and trainers, and it launches tag team combinations to new levels! Jump into battle with Charizard & braiden-gx, Venusaur & snivy-gx, Blastoise & piplup-gx, and Solgaleo & Lunala-GX, along with the triple tag team of Arceus & dialga & Palkia-GX, plus many more! Feel the stellar power of Pokémon with the sun & moon—cosmic Eclipse expansion!