The credits to Luigi’s Mansion 3 have been published by Kyoto Report, a website dedicated to keeping track of Nintendo employees.
According to the credits, 266 people were involved in the development of Luigi’s Mansion 3. These include the staff at Next Level Games and Nintendo, who helped with development, localization, testing, and more.
A couple of companies were involved with the development of Luigi’s Mansion 3 as well, such as iQue (Chinese localization), Pole to Win (QA, testing, localization), and Hellbent Games.
For the full credits, visit Kyoto Report’s official website.