Pokémon Go ‘Astral Eclipse’ event, Collection Challenge guide
The last event of the Pokémon Go “Season of Light” is “Astral Eclipse,” which lets you evolve your Cosmoem and complete a Collection Challenge.
This article references relevant content from the polygon.com website. Original article link: [https://www.polygon.com/pokemon-go-guide/2022/11/23/23475240/astral-eclipse-event-collection-challenge-lunala-solgaleo-research]

The last event of the Pokémon Go “Season of Light” is called “Astral Eclipse,” and it introduces the legendary Pokémon Lunala and Solgaleo to the game.
The event adds the last step of Special Research about Cosmog, allowing you to evolve it to its final stage. It also increases the spawn rate of Alolan Pokémon and includes a Collection Challenge.
This event runs from Nov. 23-28.
Astral Eclipse Collection Challenge
Catch the following for a reward:
Reward: 3,000 Stardust
Catch the following for a reward:
Reward: 3,000 Stardust