For one hour every Wednesday evening, Raid Battles with the currently featured Legendary Pokémon will appear in greater numbers. Mark your calendars!
Date + Time
From 6:00 p.m. to 7:00 p.m. in your local time zone on the following dates:
- Cresselia, the Lunar Pokémon—June 5 and 12, 2019
- Kyogre, the Sea Basin Pokémon—June 19 and 26, 2019
- Groudon, the Continent Pokémon—July 3, 2019
- There will be an increased number of ★★★★★ raids during the event hour.
Source: Official Pokémon GO blog