If you are hunting for the Pikmin 4 Switch XCI or the corresponding Update NSP, you need to know what the patch fixes. The base version (1.0.0) is playable, but the v1.0.1 and v1.0.2 updates address key issues:
Real-Time Strategy / Puzzle / Adventure Players: 1–2 (Co-op available in certain modes)
: If you are a PC emulator user, the XCI is plug-and-play. If you are a Switch custom firmware user, the NSP is usually cleaner because you can install the base game and the -Update- in one go.