For years, fans have been modifying the original Pokémon X ROM to create their own unique versions of the game. These modifications, known as ROM hacks, can change everything from the game's difficulty and available Pokémon to its entire story and characters. These fan-made games are often released and updated with their own version numbers, which can be anything from 1.0 to 13.0 and beyond.
To understand the update, it helps to parse the highly technical string used by preservationists, ROM archivers, and data miners: pokemon x update 13 world enjafrdeesitko verified