The dragon has returned!
Rayquaza is coming back to Level 5 Raids for one weekend only! This weekend starting on Friday, March 15 to Monday, March 18 is going to feature Rayquaza in Level 5 Raids!
This weekend is going to be different compare to when Rayquaza was first introduced into Raid Battles. There are plenty of powerful Ice type Pokemon in the game such as Mamoswine and Weavile.
Please note that nowhere in the English announcement did it mention that Rayquaza could be Shiny this weekend. It was stated in the Japanese announcement that Shiny Rayquaza will not appear during the Raid event.