If you own a legitimate copy of the game—either via a digital eShop code or the physical cartridge—extracting the file for use on a modded Switch (to improve performance or backup save data) falls under fair use in many jurisdictions.
Disclaimer: This article is for informational purposes regarding the game’s release and features. We encourage supporting developers by purchasing official copies via the Nintendo eShop. the war of genesis remnants of gray switch nsp exclusive