Pokemon | Scarlet -nsp--dlc-.rar

Purchase the Pokémon Scarlet + The Hidden Treasure of Area Zero bundle directly from Nintendo. The current price is $95. You get a clean, uncompressed download with zero risk of malware or corrupted saves.

Dump your own cartridge and DLC using a legitimate modded Switch and software like nxdumptool. This produces a personal NSP that is legally defensible (in some regions). You can then compress that personal NSP into your own .rar for backup purposes. Never share this file.

NSP stands for Nintendo Submission Package. This is the direct digital format of a game as downloaded from the Nintendo eShop. When you buy Pokémon Scarlet digitally from Nintendo, the file installed to your SD card is an NSP, encrypted with a unique title key.

In the piracy scene, an NSP is preferred over an XCI (cartridge dump) for two reasons:

Downloading Pokemon Scarlet -NSP--DLC-.rar is only the first step. To actually play it, you need specific hardware or software.