Pokemon Go's Halloween event has ended, which means Darkrai is no longer available in Raids. Before Cobalion arrives next week, however, the Legendary Regi trio have returned to the game, but they'll only be around for a limited time.

Until 1 PM PT / 4 PM ET on November 4, Regirock, Registeel, and Regice will appear in five-star Raid Battles around the world. Not only does this give you a new opportunity to add the Legendary Pokemon to your collection if you've previously missed them, you'll also have your first chance to catch their Shiny forms.

In addition to the Regi trio's return, you'll be able to find Pokemon that have a type advantage over the Legendaries--such as Geodude, Magnemite, Swinub, Aron, and Spheal--more frequently in the wild, while Aerodactyl, Shuckle, Sneasel, Skarmory, Snorunt, and Beldum will hatch more often from eggs. Incubators will also be twice as effective throughout the weekend, allowing you to hatch eggs in half the time they normally require.

Later this month, the Legendary Regigigas will make its debut in EX Raids. If you can't wait until then to catch it, Niantic is hosting a Special Research story event on November 2 called "A Colossal Discovery," which will let you encounter the new Legendary early. However, until other Special Research questlines in the game, you need to purchase a virtual ticket to participate in the event.

Once the Regi trio leave the game again on November 4, they'll be replaced by the aforementioned Cobalion, the first Gen 5 Pokemon to appear in Go. It will be available in five-star Raids until November 26. Meanwhile, Pokemon Go's November Community Day is set for November 16. The featured Pokemon this month will be Chimchar, the Fire-type starter from Diamond, Pearl, and Platinum.