If you are playing a physical cartridge of Pokémon X, the game will force you to download the latest update (v15.3) via the Nintendo eShop. However, for users of or those playing from a ROM cartridge, obtaining the standalone v15.3 CIA is mandatory for three reasons:
In CIA format, the v1.5 update typically overwrites previous update data; you do not need to install versions 1.1 through 1.4 sequentially. Compatibility & Region Information Region Free: pokemon x update 15 3ds world cia region f patched
The update is cumulative, meaning it includes all fixes from previous versions (v1.1–v1.4). Online Stability If you are playing a physical cartridge of
Addressed an issue where Pokémon evolved via Wonder Trade would occasionally fail to learn new moves. Online Stability Addressed an issue where Pokémon evolved
: You must have this update installed to use any internet-dependent features, including Wonder Trade Global Trade Station (GTS) Mystery Gift Anti-Cheat Measures