An update for Pokémon Shuffle is now available to download off the Nintendo eShop bring the game to version 1.2.2. The new Escalation Battle makes its debut with Giratina. Escalation Battles increase in difficulty every time the player clears the stage but reaching higher stage levels may make it easier to catch. Giratina's skill is Power of 4+ and if the player lines up and clears four Giratina icons, the damage dealt to the opponent is tripled! The Giratina stage will be available from June 8th, 2015 at 06:00 UTC until June 22nd, 2015 at 05:00 UTC.

Also added was New stages and 3 New Expert Stages as well as the opportunity for player to receive a Mega SpeedUp item. Details of this patch have been added to our Pokémon Shuffle page and details of the latest event has been added to our event page.

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Sources: http://www.pokemonshuffle.com/en-us/connectivity#giratina-launch and http://www.pokemon.co.jp/ex/poketoru/news/post.php/50/