Like previous games, Pokémon X & Y include a few ways to customise your game in addition to the customisation of your Pokémon and your own personal character. Like before, Pokémon X & Y allows for you to change the wallpaper of each box in the PC, but it also provides a new feature, the ability to customise the background to the battle menu for whenever you're battling

Battle Backgrounds

Picture Name
BoxDefault
BoxRed
BoxBlue
BoxPikachu
BoxStarters
BoxEevee
BoxMonochrome
BoxStickers
BoxTatami
BoxFloral Pattern
BoxElegant
BoxTall Grass
BoxPolka Ball
BoxCockpit
BoxCarbon

Box Backgrounds

Picture Category Name Unlock Method
BoxScenery 1ForestBeginning
BoxScenery 1CityBeginning
BoxScenery 1DesertBeginning
BoxScenery 1SavannahBeginning
BoxScenery 2CragBeginning
BoxScenery 2VolcanoBeginning
BoxScenery 2SnowBeginning
BoxScenery 2CaveBeginning
BoxScenery 3BeachBeginning
BoxScenery 3SeafloorBeginning
BoxScenery 3RiverBeginning
BoxScenery 3SkyBeginning
BoxMiscPoké CenterBeginning
BoxMiscMachineBeginning
BoxMiscChecksBeginning
BoxMiscSimpleBeginning
BoxSpecialSpecial 1Defeat the Elite Four
BoxSpecialSpecial 2Defeat the Elite Four
BoxSpecialSpecial 3Defeat the Elite Four
BoxSpecialSpecial 4Defeat the Elite Four
BoxSpecialSpecial 5Defeat the Elite Four
BoxSpecialSpecial 6Defeat the Elite Four
BoxSpecialSpecial 7Defeat the Elite Four
BoxSpecialSpecial 8Defeat the Elite Four