Information from Serebii:
Following their release in Japan last week, the three new Pokémon 3DS themes have been confirmed to be coming to Europe on Friday. The first is the Pokemon: Pair Art Gardevoir & Gallade which features special art of Gardevoir & Gallade. It has the music Wally’s Theme from Pokémon Omega Ruby & Alpha Sapphire.
Secondly is the Pokemon: Pair Art Latios & Latias which features Latios & Latias and the music Soaring at Night from Pokémon Omega Ruby & Alpha Sapphire. It comes in a bundle with the Gardevoir & Gallade themes for £3.19 (€3.49)
Finally is the Pokémon Amie Substitute theme which features imagery of the Substitute on the bottom screen and lots of Substitute and Pokémon on the top screen. It has the music from the Pokémon Amie mini-games in Pokémon X & Y. It can be purchased for £1.79 (€1.99)
Be sure to grab one to deck out your 3DS homepage!