Update 15 Cia Top - Pokemon X

While Pokémon X did not receive major content additions like later titles, the cumulative v1.5 update includes:

For users managing their library via custom firmware, the update is typically distributed as a Cumulative Nature pokemon x update 15 cia top

In the context of the 3DS, a (CTR Importable Archive) file is an installable package format used by modded consoles or emulators like Citra. How to Update Pokémon X and Pokémon Y | Nintendo Support While Pokémon X did not receive major content