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https://pokemonblog.com/2021/01/19/you-can-now-catch-hoenn-pokemon-including-kyogre-and-groudon-and-complete-a-themed-collection-challenge-as-part-of-the-hoenn-celebration-event-in-pokemon-go/
You can now catch Hoenn Pokémon, including Kyogre and Groudon, and complete a themed Collection Challenge as part of the Hoenn Celebration event in Pokémon GO