Following the launch of Pokémon Sun and Moon two Pokémon themes have made their way to the 3DS console!
The first is Pokémon: Solgaleo and Lunala, which features special art of the two legendary Pokémon from Sun and Moon. It has the Adventure Begins music from the new games. The second is Pokémon: Tropical, which features artwork of the starter Pokémon in Sun and Moon as well as other Alolan Pokémon. It has the Melemele Island 1 music from the new games.
The themes cost $2.60AUD each and can be purchased by going into the theme options within your 3DS console.