This theme is based off the game "POKéMON MASTERS EX".
This theme represents Calem and Serena as the Neo Champions of the kalos region.
Pokémon Masters EX is a free-to-play mobile game for Android and iOS developed and published by DeNA. It is based on the Pokémon media franchise. Set on the artificial island of Pasio, the game allows players to battle and recruit various prominent Pokémon Trainers from the main series games and anime.