Pokémon Go' Raid Boss Update: Shiny Groudon and Kyogre Return

Other Pokémon from the Hoenn Region are being discovered in Raids during the two-week event.

Kyogre, Groudon, & More Return To Pokémon GO In January 2021

Groudon Pokémon GO Hub

Should I be doing Kyogre or Groudon Raids? : r/pokemongo

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Pokemon Go Tour Hoenn Raid schedule & Primal Raids explained - Dexerto

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Pokémon Go' Raid Boss Update: Shiny Groudon and Kyogre Return

When are Primal Kyogre & Primal Groudon released in Pokemon Go? - Dexerto

All Legendary Pokemon in Pokemon GO and how to catch them