The Legendary Pump-action Shotgun is an upgraded version of the Pump-action Shotgun in Palworld. Check out how to get a Legendary Pump-action Shotgun Schematic, what you will need to craft it, and how it differs from a regular Pump-action Shotgun.
How to Locate the Legendary Pump-action Shotgun Schematic
Schematics for a Legendary Pump-action Shotgun can be obtained from the Suzaku Alpha Boss. Once you have the schematic, you will be able to craft a Legendary Pump-action Shotgun as long as the schematic is in your inventory.