Ditto (Pokémon: Detective Pikachu)

"Ditto!"

- Ditto while trying to kill Tim Goodman (also it's only spoken line).

Ditto, also known as Ms. Norman, Roger Clifford and various other names, is the secondary antagonist of the 2019 video game film Pokémon: Detective Pikachu. It is a Pokémon with vast shape-shifting abilities, who acts as the assistant, Pokémon partner and accomplice of Howard Clifford.

In it's primary form of Ms. Norman, it is portrayed by Suki Waterhouse. As Roger Clifford, it is portrayed by Chris Greere. As Lucy Stevens, it is portrayed by Kathryn Newon.

Past
According to Howard Clifford's son Roger, Ditto was the result of one of his father's many experiments with Pokémon, and was created with immense shape-shifting abilities. Clifford then took Ditto in as his Pokémon partner, and Ditto would in turn adopt the persona of Ms. Norman; Clifford's human assistant, who would perform tasks that Clifford would be unable to do in his disabled state. It also continued to help Clifford complete his plans of merging all people and Pokémon in the world in order to help humanity evolve, and was presumably aware of his role in trying to have Harry Goodman and his Pikachu eliminated.

Pretending to be Ms. Norman
Ditto is first seen when Tim and an amnesiac Pikachu go to the Clifford New Network building to get information about Harry from Lucy Stevens; an intern at the network with the desire to be a reporter. After airing an advertisement for their upcoming parade in celebration of Ryme City, Roger angrily criticizes his father for seemingly always overshadowing him and praising his own accomplishments; however, before the argument can continue, Ditto (taking human form) wheels Howard away. Later on, after meeting with Lucy and interrogating a Mr. Mime for information, Tim and Pikachu are lead to the arena where Sebastian holds illegal Pokémon battles in their search for the source of the drug R (which causes the Pokémon who inhale it to go berserk); however, while they are there, they are spotted by Ms. Norman, who texts Clifford to tell him about their presence. Ms. Norman later leaves the arena some time before Sebastian's R is accidentally unleashed and causes all the Pokémon there to rampage.

Not long after the arena is compromised by the police and Lieutenant Yoshida shows Tim and Pikachu footage that proves it was unlikely Harry survived his accident, Ms. Norman arrives outside police headquarters and silently motions Tim and Pikachu to come with her. Ms. Norman takes them to Clifford's office and then leaves, with Pikachu commenting on how quiet she is. Clifford proceeds to implicate his son in the distribution and creation of R and uses a holographic recreation of Harry's accident to show Tim and Pikachu that he did in fact survive, but was abducted by Mewtwo, whom they need to find in order to locate Harry.

Pretending to be Roger Clifford
Following Clifford's lead, Tim and Pikachu go with Lucy and her Psyduck to Pokémon Comprehensive Laboratories to find what Harry was investigating there; while, unbeknownst to them, they are being watched by Roger Clifford through the security cameras (though, in reality, "Roger" is again Ditto in disguise). Roger, while driving to the facility with his other henchmen, then remotely releases the Greninja PCL was experimenting on to deal with Tim and the others, who are narrowly able to escape. Pikachu is subsequently injured after escaping the field of colossal Torterra created by PCL's growth-enhancing experiments, and Tim manages to convince a group of Bulbasaur and Morelull to lead him to a Pokémon capable of healing Pikachu, and they take him to Mewtwo. Mewtwo heals Pikachu and begins to explain his intentions by projecting his memories into Tim and Pikachu—including the fact Pikachu had helped him escape and met with him after the accident—but before he can finish, Roger restrains and captures him using machines and leaves Tim and Pikachu behind.

Truth Revealed and Defeat
A short while later, Tim, Lucy and Psyduck return to the city to warn everyone about Roger's plans—Pikachu having abandoned them after concluding that he betrayed Harry and lead to his disappearance. Lucy attempts to warn the mayor about Roger's plans during the parade, only to be spotted by Roger himself; meanwhile, at the same time, Tim tries to warn Clifford, only to find that he has used Ann Laurent's neural device to transfer his conscience into Mewtwo's body and is planning on using his newfound power along with the R gas hidden in the parade balloons to merge the minds of humans into the bodies of Pokémon. As Clifford begins to enact his plan and attacks the city, Tim realizes that the only way to stop him is to remove the neural device from his body and thus free Mewtwo from his control. Before he can do this, he finds Roger tied up and stuffed in a closet, and turns around to see another Roger, which reveals itself to be Ditto by changing into Ms. Norman and then into it's natural form. Shape-shifting again, Ditto takes Lucy's form (also revealing that it needs to use glasses to cover up it's naturally occurring eyes, which don't change no matter it's form) and proceeds to fight with Tim, before transforming into a number of other Pokémon as well to beat him further.

After punching Tim over to the window as a Machamp, Clifford orders it to finish him off while he deals with Pikachu, and Ditto attempts to do so by transforming into Cubone and beating at Tim's fingers. Before Tim can fall off, Roger smacks Ditto out of the building with a chair and pulls the former up, mentioning how Ditto was created before the Pokémon flies back in as a Braviary and turns into a Bouffalant to knock him out. Ditto continues to change form and attack Tim, and manages to corner him, intending to finish him off. Before it can succeed, however, Tim unleashes a vial of R in it's face, causing it to erratically change through different forms before passing out. It is unknown what happened to Ditto after Clifford's arrest.

Trivia

 * Throughout the various forms of Pokémon media, there have been numerous instances of Dittos using their powers to impersonate people (most notably in the anime and the 2017 games Pokémon: Ultra Sun and Ultra Moon), though this is the first instance of a Ditto using said ability for nefarious purposes.
 * It is said that Clifford's specific Ditto was created during one of his experiments, though it is unknown as to whether are not there are other Dittos that exist in the movie's world.
 * Curiously, a popular Pokémon fan theory suggests that Dittos are actually the result of failed attempts to clone the Pokémon Mew, with the only successful attempt being Mewtwo, who PCL performed many experiments on in the film. Though it has yet to be confirmed, it is possibly suggested from Ditto's origin that it was created from Mewtwo.