It has been confirmed that Shiny Zygarde is to be distributed next month as part of the Year of Legendary Pokémon. In the United States, it will be obtained through serial code at Gamestop and EB Games in Canada from June 1st through June 24th while in Europe and Australia it will be available over the Nintendo Network from June 1st through June 22nd.
https://img.pokemonbbs.com/upl/18/826640-1526956682_1.jpg
https://img.pokemonbbs.com/upl/18/826640-1526956682_2.jpg