Game Freak Resource Package
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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.
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.
How to open a GFPAK file
You can use Switch-Toolbox (Windows) to extract the resources a GFPAK file contains. You can also use Switch-Toolbox to package resources into a GFPAK file.