It wasn't too long ago that Niantic introduced a new mechanic to Pokemon GO in the form of Raid Battles. It was via this raid mechanism that they later gave us Legendary Pokémon, but there were some noteworthy omissions. At least one of those has now been rectified, as the legendary Pokémon Mewtwo has been added to the game via a new invite-only Exclusive Raid Battle system. 

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