Pokemon XY 2016 Summer Tins - Rules of Play says:
Three great Legendary Pokémon revealed! Choose the forest majesty of Shiny Xerneas-EX, the destructive force of Shiny Yveltal-EX, or the battle-ready power of Zygarde-EX!
In the tin, you’ll find:- 1 of 3 special foil Pokémon-EX cards: Shiny Xerneas-EX, Shiny Yveltal-EX, or Zygarde-EX!
- 4 Pokémon booster packs!
- A code card to unlock a playable deck in the Pokémon Trading Card Game Online!