Walkthrough

1. Speak to Meowth regarding their shack and it being a little too dark for their taste. They will ask you to set up at least two mushroom lamps to spruce up the place.
2. Craft 2 mushroom lamps at your workbench and set them up all around the shack that Meowth resides in.
3. Speak to Meowth and report that you've set up the lamps to complete the request!

Walkthrough source: Game8.