Extract the POKLGEV...zip file to get the .nsp update file.
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
Used to update a pre-installed base game ( .nsp or .xci ) to a newer version to fix bugs or add content. Extract the POKLGEV
