Pokémon: The First Movie is the reason Mewtwo is in Detective Pikachu - Polygon

Pokémon: The First Movie: Mewtwo Strikes Back arrived in 1998. More than 20 years later, the story of Ash, Pikachu, Mew, and Mewtwo has new resonance as the Pokémon come to live in live-action while keeping Pokémon game and anime canon alive.

Realistic Pokémon Fanart Got This Artist a Job on Detective Pikachu

Why Mr. Mime Was Almost Cut From Pokemon: Detective Pikachu - IGN First - IGN

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Netflix's Pokemon movie: what to know about Mewtwo Strikes Back – Evolution

MewTwo Strikes Back: Evolution' Review: How Good is the CGI Remake? - Thrillist

Mewtwo (Detective Pikachu) - Bulbapedia, the community-driven Pokémon encyclopedia

New Pokemon Movie 'Mewtwo Strikes Back Evolution' Debuts First Trailer - Heroic Hollywood

Detective Pikachu' Mewtwo Twist Explained: How the Games Tie In – The Hollywood Reporter

Detective Pikachu, Pokémon Wiki

Detective Pikachu director: twist ending didn't need post-credit scene - Polygon

Detective Pikachu Writer Reveals Why Film Connects to Pokemon: The First Movie