"Shadow Raids introduce Shiny Shadow Mewtwo in Pokémon Go"

Pokémon Go is introducing Shadow Raids, a new type of in-person-only raid that will allow players to catch Shadow Legendary Pokémon like Mewtwo by battling in gyms. The raids will also introduce Shiny Shadow Legendary Pokémon and a new mechanic that will see players face tougher, "enraged" Shadow Pokémon. The raids will go live on May 22 and will be part of the game's Rising Shadows event. Players can use a new item called a Purified Gem to quell the enraged state of Shadow Raid Bosses. Shadow Raids are designed to be "an evergreen mainstay within Pokémon Go," and are just the tip of the iceberg for new features and development in the game this year.