How to evolve Cosmog into Solgaleo and Lunala in Pokemon GO?

Cosmog is again available in Pokemon GO as part of the Solstice Horizons event during the Season of Hidden Gems.

Pokemon GO: How to Get Solgaleo and Lunala

Pokemon GO: How to Get Solgaleo and Lunala

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How to get Solgaleo and Lunala in Pokémon Go

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