[EX] Shiny Charizard will be available for purchase for the first time from September 19 through September 30.
☆ NintendObs Weekly – Monday, September 17, 2018 – Sunday, September 23, 2018.
Charizard Rules the Duels
You can get [EX] Shiny Charizard, [UX] Shiny Mega Charizard X, and [UX] Shiny Mega Charizard Y in Pokémon Duel.
September 19, 2018
It’s easier than ever to harness the power of Mega Evolution in Pokémon Duel, so we’re celebrating with one of the most iconic Pokémon capable of Mega Evolving: Charizard. [EX] Shiny Charizard will be available for purchase for the first time from September 19 at 1:00 a.m. PDT through September 30 at 6:59 p.m. PDT. That’s not all—you’ll also be able to purchase both [UX] Shiny Mega Charizard X and [UX] Shiny Mega Charizard Y during the same period.
— Pokémon News
…Wanna play? Buy a 3DS.
That being said, click on Pokémon Duel for everything you need to know about the game. 😀