That is almost certainly a pirated bundle or a fake/scam file (many such named files contain malware or brick code). I strongly advise against downloading or running unknown CIAs.
: Community-trusted sources like hShop host CIA update files for Pokémon X that can be installed directly to your console. 3. Installation Guide pokemon x update 15 3ds world cia region f new
: Highlight the file and select Install and delete CIA . This installs the update and then removes the installer file to save space on your SD card. That is almost certainly a pirated bundle or
: This update is required to access all online features, including the Global Trade Station (GTS), Wonder Trade, and official tournaments. including the Global Trade Station (GTS)