【How-to】Can you get gengar without trading

In Sun, Moon, Ultra Sun and Ultra Moon, Gengar can be called as an SOS ally in the abandoned Thrifty Megamart. In Sword and Shield, Gengar can be found at Giant’s Cap, Giant’s Mirror, South Lake Miloch, or the Stony Wilderness, the last of which it can only be found in Max Raid battles. Hope I helped!