UPDATE: So it seems like legendary Pokémon won't be that easy to spawn. I forgot to mention that some Challenges have to be completed in order to help those awesome bird to spawn. We all people at the event and the rest of us that couldn't go have to work together to catch as many Pokémon as possible to allow them legendary Pokémon to appear. There is no specific amount on how many Pokémon we have to catch, but once they spawn at Chicago Event, them they will start spawning elsewhere, so stop reading and get to cath'm all!
On July 20th, so 2 days ago, Pokémon Go had a new announcement, Legendary Pokémon are coming to Pokémon Go. These legendary Pokémon will spawn in July 22 so that is TODAY! The Pokemon that we will be able to see are the 3 Legendary birds from Kanto Region, Articuno, Moltress and Zapdos. But they are not the only ones, as we know we have 2nd Generation Pokemon in the game so besides those 3 birds we will also have Lugia and Ho-Oh.
These legendary Pokemon will be available at Raids, so I am assuming they will be the Tier 5 raids. Just as shown in the first preview when people fought Mewtwo, once the raid is over and the Pokemon is defeated, everyone will have a chance to capture the Pokemon. One thing you will not be able to do with your Legendary Pokemon is leave it at a Gym as those Pokemon will have to stay with its trainer.
If you watch the full video above you will see some cool details, I wish the game was VR like the way the video shows it. The video is 2:39 minutes long, it shows how the people fight in Gyms and how they feed treats to their Pokemon guarding gyms to continue winning. Then we see a raid alert and we see the 5 birds. Once the fights starts you will have a timer as other raids so better be quick. At the end of the video we see Pikachu beating Lugia and everyone gets the message that it has been captured. Then the camera zooms out over earth and we see….Mewtwo!