- Mountains of Power: From Friday, January 7, 2022, at 10:00 a.m. to Thursday, January 13, 2022, at 8:00 p.m. local time, work with Spark to activate the second part of the mysterious door by journeying through terrain reminiscent of the mountains found in regions like Johto and Sinnoh.
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—The Pokémon GO team
Source: Official Pokémon GO blog