Pokémon Masters EX, the strategy and battling Pokémon game for mobile platforms, is now available for download on the App Store (iOS) and Google Play (Android). In celebration of the game’s popularity, special in-game events and rewards are offered for a limited time on a regular basis. Among the slew of new additions on the way, holiday-themed Skyla and Erika sync pairs will be added to the ever-expanding world of Pokémon Masters EX on December 10, 2020. These two characters will be available as part of the Deck the Halls event.
Source: Official Pokémon Masters EX site