Game Freak and The Pokemon Company continue their trend of offering previous generations of monsters in this manner, however, as the Mewtwo raid battles are ongoing for the next handful of days.

Source: https://gamerant.com/pokemon-scarlet-violet-dlc-leaks-indigo-disk-pokedex-list/

However, this event marks the first appearance of Mewtwo in Raid Battles.

Source: https://www.mutiny.in/a-pokemon-go-player-flexes-hunting-shadow-raid-mewtwo/

If you’re having trouble finishing Shadow Mewtwo Raid, check out our guide on the best counters and weaknesses to employ in battle.

Source: https://www.mutiny.in/a-pokemon-go-player-flexes-hunting-shadow-raid-mewtwo/

She tells Mewtwo not to be sad, because it's still alive, and being alive is wonderful, before vanishing into nothing.

Source: https://screenrant.com/mewtwo-backstory-pokemon-anime-deeper-fans-know/

So it sounds like you’ll be able to travel around these new areas with a Mew or Mewtwo following you around.

Source: https://kotaku.com/pokemon-scarlet-violet-mew-code-event-mewtwo-how-to-get-1850716762

Something about Mewtwo clashing with Darkrai causes a unique side effect, and the last few panels of this volume show all three Pokedex Holders now frozen in stone (as well as Silver).

Source: https://gamerant.com/pokemon-manga-disturbing-moments/

The movie took a relatively mature tone compared to the usual series, with elements such as Ash's near demise and the traumatic creation of Mewtwo.

Source: https://gamerant.com/pokemon-the-first-movie-good-reviews-retrospective/

This region continues to have some of the most well-known and popular Pokémon overall such as Pikachu, Charizard, and Mewtwo.

Source: https://www.cbr.com/most-recognizable-pokemon-from-kanto-region/