The Armored Mewtwo event has started in Pokémon Go, and it will happen from February 25 to March 2.
For a limited time, you can battle Armored Mewtwo in a five-star raid, and there are other raids available in Pokémon Go with Gengar and Nidorino wearing party hats. The Gengar and Nidorino versions of the party hat will be available in four-star and two-star raids, respectively. They will only be available on Raid Day, March 1, from 14-17 PM in your region.
This is the same period that Armored Mewtwo will be available for you to capture. All trainers will receive five free Raid Passes to use during the event, giving you the option to use them on Armored Mewtwo or the Gengar and Nidorino Party Hat. Potentially, you can come across the shiny versions of these Gengar and Nidorino party hats, increasing their overall quality for every trainer. Gengar party hat will have lick and psychic move when you catch them.
During the event, you may also encounter clone Pokémon, which are alternate appearances of Charizard, Blastoise, Venasaur, and Pikachu. Additionally, you have the option to capture party hat versions of Pikachu, Eevee, Charmander, Squirtle, and Bulbasaur, and potentially they can be the shiny version. You can find them at any time during the event.
You have an even more limited time to capture the Gengar and Nidorino Party Hat on March 1 from 14-17 PM in your region. If you capture Armored Mewtwo first, you might want to consider pursuing them, especially with the possibility of getting a shiny version.
