What is .PKX file extension?
Decrypted Pokémon file used by Pokémon games for the Nintendo 3DS platform, such as Pokémon X and Pokémon Y; stores information about a Pokémon, including the species, EXP, abilities, attacks, and current owner.
PKX files can be extracted from .BIN files using a PKX dumper utility and can then be opened and edited in Windows using utilities like PKHeX (a Gen 6 equivalent of PokeGen). PKHeX can also be used to convert generation 3, 4, and 5 .PKM files to the new PKX format. The PKHeX program can only load and save files that have been decrypted.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.