A few brand-new challenges have begun in both Pokémon Shuffle and Pokémon Shuffle Mobile. First is a new Pokémon Safari, which includes Unown N, Unown I, Unown C and Unown E. It runs until September 26, 2017. In addition to this, a special Shiny Ho-Oh is being given to all players when they check in. Finally, special stages for Chikorita (Winking), Lugia, Meganium and Typhlosion have begun repeat runs. Lugia, Meganium and Typhlosion run until October 3, while Chikorita runs until September 26. All of these additions require the version 1.4.22 to download.
Source: Serebii
Pokémon Blog 