Mewtwo Raid Hour Pokemon GO: Postponed Until Further Notice
By Andrew Lin

Mewtwo Raid Hour Pokemon GO will unfortunately be postponed. The much anticipated event will have to be rescheduled to a later date. Here's what we know so far.
Mewtwo Raid Hour Pokemon GO: Cancelled
Due to technical difficulties, Legendary Raid Hour with Mewtwo will be postponed to a later date. We apologize for the inconvenience.
— Niantic Support (@NianticHelp) September 18, 2019
Mewtwo had been the standard EX Raid boss, until it was replaced by Deoxys this year. While Mewtwo is available in standard five star raids, this Raid Hour would have the opportunity to catch a Shiny Mewtwo. This Mewtwo would also know the move Psystrike, which would make this Raid Hour Mewtwo especially powerful.
Mewtwo ✨
— Pokémon GO (@PokemonGoApp) September 16, 2019
Has
Returned. ?
Those who are brave can find it in five-star raids—are you up to the challenge? pic.twitter.com/CSBA64k7KU
After issues in some regions for the Legendary Raid Hour, Niantic quickly decided to pull the plug on the event. They extended the Raid Hour for those affected, but many players had already left.
That still isn't an hour. It's 40 minutes. And all the raiders have gone home as it's almost an hour and a half late. Why bother with a legendary raid 40 Minutes at all. Redo it tommorow!
— James Clark (@SirCluckCluck) September 18, 2019
It unknown if the affected region will have another attempt at the Raid hour when everything gets settled. In the mean time, you can still find counters for Mewtwo in normal raids for when the event comes back. Why not give the new Hydreigon a try?
Photo courtesy of Niantic.