Get ready to take on some rare and popular Pokémon during a week of frenzied Pokémon GO Raid Battles. From May 21, 2019, at 1:00 p.m. until May 28, 2019, at 1:00 p.m. PDT (GMT −7), head out to Pokémon GO Gyms and you may encounter rare Pokémon, such as Chansey, Clamperl, or Metagross, in Raid Battles. You'll get double the normal amount of Stardust and XP for participating in Raid Battles, too.
If you want even more fun with raids, there'll be a special hour of Raid Battles on Wednesday, May 22, 2019, from 6:00 p.m. to 7:00 p.m. local time. Much like during the Legendary Lunch Hour, each Gym will spawn a Raid Battle during this period. Any of the Pokémon featured during this special week of raids may appear during the special raid hour, so head out to find a Gym hosting the Pokémon you'd like to add to your collection.
Keep an eye out for some raid-themed Field Research tasks during the event while you're traveling between Gyms. These tasks are sure to have great rewards. And don't forget to look for wild Pokémon—if you're really lucky, you may even encounter a Shiny Bronzor!