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Unfortunately, at this time, there is not a way for trainers to obtain Mewtwo in battle, as it’s not currently a part of any raids. If you would like to add a Mewtwo to your collection, you’ll have to trade with a friend.
This, of course, will take a lot of Stardust, since it’ll be considered a Special Trade, and you’ll have to find someone willing to part with a Mewtwo.
It’s possible Mewtwo will return to the game in future raids, though, so watch the Pokémon GO social media for that.
Source: https://www.distractify.com/p/how-to-get-mewtwo-in-pokemon-go
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