Poklgev-(rf)-update-nswtch-nsp-ziperto.rar -

Means this update will work on a Switch console regardless of its region (e.g., US, Europe, Japan).

NSP files are typically used for homebrew-enabled or modified consoles (running SX OS or Atmosphere) to install updates from unofficial sources. How to Use (Context: Modified Switch) POKLGEV-(RF)-UPDATE-NSWTCH-NSP-ZIPERTO.rar

A Nintendo Submission Package. This is the digital format of a switch game, similar to a digital cartridge or eShop file. Means this update will work on a Switch

Likely short for a game title, potentially PokéLand Legends or a similarly named title, frequently seen in Ziperto's NSP listings. POKLGEV-(RF)-UPDATE-NSWTCH-NSP-ZIPERTO.rar

Extract the POKLGEV...zip file to get the .nsp update file.