.PKX File Extension
Decrypted 3DS Pokémon Save File
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What is a PKX file?
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.