These past Legendary Pokemon return to Tier 5 Raid Battles and they bring their shiny variants!
Cresselia
Cresselia will be available in Raid Battles from May 27, 2019 at 1:00 pm PDT until June 18, 2019 at 1:00 pm PDT.
For the first time, you may encounter a shiny Cresselia!
Cresselia 
Shiny Cresselia
Kyogre
Kyogre will be available in Raid Battles from June 18, 2019 at 1:00 pm PDT until June 27, 2019 at 1:00 pm PDT.
You may encounter a shiny Kyogre!
Kyogre 
Shiny Kyogre
Groudon
Groudon will be available in Raid Battles from June 27, 2019 at 1:00 pm PDT until July 10, 2019 at 1:00 pm PDT.
You may encounter a shiny Groudon!
Groudon 
Shiny Groudon
My thoughts
Kyogre and Groudon are among the best Legendary Pokemon around, here we have another shot at capturing some good IV Pokemon, collecting candy for powering up and hunt for that shiny. Cresselia is not that useful but its new shiny form is a nice incentive.
