Pokemon Island Guardians GX Premium Collection - Rules of Play says:

The Island Guardians watch over the Alola region, protecting their people and their Pokémon! Now two of those amazing Pokémon are ready to join your team as playable Pokémon-GX, with amazing GX attacks to turn the tide in your favor. What’s more, this collection includes a beautiful playmat for your next tournament game, and a huge oversize card featuring Tapu Lele-GX, suitable for adding a little tropical sunshine to any Trainer’s home or office!