Question: pokemon ultra sun and moon how to get gengar?
Answer: How to Get a Gengar. Once you finish the Ula'ula Trials, if you encounter a Haunter at Thrifty Megamart, it might summon a Gengar as help. The recommended balls to use are Great Balls and Ultra Balls since these have high capture Rates. Alternatively, Haunter will evolve into Gengar when traded.