Niantic recently announced Legendary Raid Hour events for every Wednesday evening in September for Pokémon GO players around the world. Read on below for more details:
For one hour every Wednesday evening, Raid Battles with the currently featured Legendary Pokémon will happen more frequently.
Date + Time
From 6:00 p.m. to 7:00 p.m. in your local time zone on the following dates:
- September 4, 2019: Raikou, Entei, and Suicune
- September 11, 2019: Deoxys
- September 18, 2019: Mewtwo
- September 25, 2019: To Be Announced
Features
- There will be an increased number of five-star raids during the event hour.
- Due to issues with the September 18 Raid Hour in New Zealand, Niantic has extended the period until 8 p.m. local time.
- The Mewtwo Raid Hour has been postponed entirely due to “technical difficulties.”
- Niantic has published a scheduled tweet about the Mewtwo Raid Hour, but please be aware that it is still postponed to a later date.
https://twitter.com/PokemonGoApp/status/1174307101558136834
Source: Official Pokémon GO blog
Pokémon Blog 
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