A few brand-new challenges have begun in both Pokémon Shuffle and Pokémon Shuffle Mobile. First is a new stage featuring Bewear, which will run until January 2, 2018. Next is a stage for Dugtrio, which will run until December 26, 2017. Then there is a Mega Beedrill competitive stage, which runs until December 26, 2017. Finally, the Groudon, Ash-Greninja and Landorus Therian Forme stages have begun repeat runs. In addition to these new stages, Shiny Charizard is being distributed to all Pokémon Shuffle and Pokémon Shuffle Mobile players. All of these additions require the software version 1.4.34 to download.
Source: Serebii