What is a GFPAK file? A GFPAK file is an archive that contains resources used by a Nintendo Switch Pokémon game. For example, a GFPAK file may contain a 3D model, textures, and other files used to show a Pokémon in-game. Pokémon Sword and Shield, Pokémon Legends: Arceus, and the Pokémon: Let's Go series all use GFPAK files.

More Information Most Pokémon players will never encounter GFPAK files. However, Pokémon modders frequently extract GFPAK files from games and alter the resources they contain. For example, a modder might retrieve a GFPAK file from a game, extract the assets the GFPAK file contains, and alter those assets to make a Pokémon appear differently in-game. After modifying the resources a GFPAK file contains, modders repackage the resources into a new GFPAK file. They can then install the file in the game from which it came, using custom Nintendo Switch firmware, and/or distribute the file for other players to install.