For those who may be unfamiliar, the 301 NSP link refers to a specific type of file that allows players to access and play Pokémon Scarlet on their Nintendo Switch console. NSP stands for "NSP file," which is a file format used by the Nintendo Switch to distribute and install games. The "301" in the link refers to a particular version or update of the game.
: Note that as of June 2025, even newer updates like Version 4.0.0 have been released, which include all fixes from previous versions including 3.0.1. pokemon scarlet 301 nsp link
Searching for the v3.0.1 file specifically shows you are smart. The base game (v1.0) was nearly unplayable at launch. For those who may be unfamiliar, the 301