The legendary Latios will be available in Raid Battles in a Special Raid Week that lasts from Monday, April 15, 2019 through Monday, April 22, 2019. Additionally, there is a chance that Latios may be Shiny while attempting to catch it.
Specifically, it will start appearing at 1pm PDT (GMT-7) on April 15 and will then be phased out on 1pm PDT (GMT-7) on April 22. You’ll only have that time frame to challenge it and catch it before it flies off until it makes its return someday in the future.
The Legendary Lunch Hour “experiment” for Pokémon GO appears to have been a success, as the app will be serving up another Legendary Lunch Hour on April 10, 2019 from 12:00pm–1:00pm local time.
During this time, the rate of 5-star Raid Battles featuring Origin Forme Giratina will be increased, with the hopes of giving your friends, coworkers, and classmates a chance to grab a Giratina after grabbing a bite to eat.
The fearsome Giratina is returning to Pokémon GO Raid Battles in its Altered Forme from Thursday, March 28 at 1:00pm PDT (GMT-7) through Tuesday, April 2 at 1:00pm (GMT-7).
After that point, Giratina will fight Trainers in its Origin Forme in Raid Battles instead. Origin Forme Giratina will then be available in Raid Battles until Monday, April 29th at 1:00pm (GMT-7).
Spring is nearly upon those in the northern hemisphere, while Autumn has almost arrived down in the southern hemisphere. To celebrate this change of seasons, Pokémon GO will be featuring Grass-type Pokémon front and center from March 19, 2019 at 1:00pm PDT (8:00pm GMT) through March 26, 2019 at 1:00pm PDT (8:00pm GMT).
Beginning March 25, 2019, Defense Forme Deoxys will appear as an EX Raid boss available for Trainers packing EX Raid Passes. Deoxys itself is a Mythical Pokémon, but it is has several different forms. Defense Forme is one such form and packs much greater defensive capability than its Normal Forme.
In order to be eligible for an EX Raid, you’ll need an EX Raid Pass, which you have a chance at receiving after clearing a Raid Battle at a qualifying Gym. The EX Raid Pass lists the time and date of the EX Raid event and you’ll need to be there at the given time in order to participate.