To evolve Gimmighoul into its evolved form, you need to use a Sinnoh Stone on Gimmighoul. Gimmighoul evolves into Golgoth when exposed to a Sinnoh Stone. Make sure Gimmighoul is at or above its evolution level, which is level 35, and hold a Sinnoh Stone in your bag. Then select Gimmighoul on your Pokemon team screen and choose "Evolve" - a screen will prompt you to use the Sinnoh Stone, completing the evolution into Golgoth.
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