You can find the official version of Pikmin 4 at the following retailers: Crossy Road Castle for Nintendo Switch
The scene is riddled with fake files (malware disguised as .NSP files). Here are the technical signatures of a legitimate Pikmin 4 release: pikmin 4 switch nsp xci update eshop repack
Remember to always verify your file hashes against Scene release databases, and keep your custom firmware signatures (sigpatches) updated, or Pikmin 4 will ask you to re-download the game from the actual eShop—ironically, the one place a repack cannot help you. You can find the official version of Pikmin
Always look for the "base + update" bundled together. If you download an update alone, it won’t work. it won’t work.