Here is the guide to install NSP files:

  1. Download Pokemon Quest with OFW from eShop;
  2. Download DevMenù, place the 2 folders of the DevMenu (exefs and romfs) in X:\sxos\titles\01005D100807A000
  3. Start SX OS;
  4. Launch Pokemon Quest;
    1710411328078.png
  5. Click on "Install from SD"
    2018070401405700-E4B364C957D95017CA1171810D655865.jpg
  6. Choose NSP to install and click on "Start"; Installation completed
    2018070401410200-E4B364C957D95017CA1171810D655865.jpg
  7. Restart the SX OS;
Enjoy!