Question: how to evolve galarian yamask?
Answer: Galarian Yamask evolves into a Runerigus. To evolve your Galarian Yamask into a Runerigus, you have to make it take 49 or more damage and then take it to a specific spot in the Dusty Bowl zone of the Wild Area. Your Galarian Yamask's level doesn't matter, as long as it can live with at least 49 health points missing.