Pokémon: Mewtwo Strikes Back—Evolution

Scientist Dr. Fuji is hired by Giovanni, leader of Team Rocket, to utilize his expertise in cloning in order to create a living weapon based on an eyelash from legendary Pokémon Mew. Soon after the weapon is created, it gains sentience and is named Mewtwo.

Several years later, Mewtwo has fully awakened from a long slumber in a laboratory on New Island, and learns of his origin as Mew's clone from Dr. Fuji. Infuriated that Fuji and his colleagues see him as nothing more than an experiment, he unleashes his psychic powers and destroys the laboratory, killing Fuji and the rest of the scientists. Giovanni, witnessing the carnage afar, approaches and convinces Mewtwo to work with him to hone his powers. However, after Mewtwo learns of his purpose to be a weapon for Giovanni's benefit, he escapes back to New Island where he plots his revenge against humanity.

After Mewtwo rebuilds the laboratory and establishes a base there, he invites several trainers with hologram messages to battle the world's greatest Pokémon trainer at New Island. Ash, Misty, and Brock receive a message and accept the invitation, but when they arrive at the port city, Old Shore Wharf, Mewtwo creates a storm, causing the boats on the wharf to be closed off for safety. As a result, Ash's group are picked up by Team Rocket disguised as captains on a Lapras-shaped sailboat. After the storm sinks their vessel in the middle of the ocean, Ash and his friends use their Pokémon instead to reach New Island.

Escorted into the island's palace by the woman who appeared on the hologram, Ash and the other trainers who were able to reach the island encounter Mewtwo. The woman is revealed to be a brainwashed Nurse Joy after she is released from Mewtwo's mind control. Mewtwo challenges the trainers using cloned Pokémon. Meanwhile, Team Rocket also reaches New Island and explores its inner sanctum with a Mew innocuously following them. After Mewtwo's clones effortlessly defeat the challengers' Pokémon, he confiscates them and expands his clone army. Ash chases after his captured Pikachu down the cloning lab, where Team Rocket's Meowth is also cloned. Ash destroys the cloning machine, frees the captured Pokémon, and leads them to confront Mewtwo and his clones. Mew then reveals itself and Mewtwo challenges it in order to prove his superiority.

All of the Pokémon originals battle their clones save for a defiant Pikachu and Meowth, who makes peace with his own clone after realizing the senselessness of their fighting. Horrified at the pain and anguish felt on both sides of the battle, Ash puts himself in between a psychic blast caused by Mewtwo and Mew's fighting, leading to Ash to become stone. Pikachu tries to revive Ash with its electricity but fails. However, the tears of the Pokémon are able to heal and revive Ash. Moved by Ash's sacrifice, Mewtwo realizes that he should not have to be judged by his origins but rather his choices in life. Departing with Mew and the clones, Mewtwo turns back time to just before the trainers leave Old Shore Wharf, and erases everyone's memories of the event.

Back in Old Shore Wharf, the now-restored Nurse Joy has returned to reopen the Pokémon Center to shelter the trainers. The storm outside clears up, Ash spots Mew flying through the clouds and tells his friends of how he saw another legendary Pokémon the day he left Pallet Town. Meanwhile, Team Rocket find themselves stranded on New Island but enjoy their time there.

After the credits, a brief scene shows Mewtwo, Mew, and the clones flying towards Mount Quena.

Since the film is a near shot-for-shot remake of the first Pokèmon film, with minimal changes in the script, The Pokémon Company had to obtain the rights to that script from the estate of Takeshi Shudo, who had written the screenplay for the original film.[4] According to film director Kunihiko Yuyama, the production staff chose to animate the film using 3D graphics to portray a "different dimension of the Pokémon world" that would normally be difficult to carry out through other methods of animation.[5] Though the film was primarily based on the Kanzenban or "Complete" version of the original film, a scene featuring a young Mewtwo growing up with clone companions that eventually passed away was not adapted for the remake but acknowledged during the film's marketing cycle.[6][7]

The film was publicly announced on December 14, 2018.[8] Despite Unshō Ishizuka's death on August 13, 2018, the staff confirmed that his narration work was featured in the film.

For the film's end credits, the English song, "Keep Evolving", is performed by Haven Paschall (who voiced Serena in the Pokémon XY and XYZ series as well as Risa in Pokémon the Movie: The Power of Us) and the Sad Truth and composed and produced by Ed Goldfarb, who composed the score for the international version of the anime series; for the opening, a remake of the Billy Crawford version of the English theme song from the first film, itself a remix of the original theme song from the Pokémon: Indigo League season originally composed by John Loeffler and John Siegler, titled "Pokémon Theme (Mewtwo Mix)", is performed by Ben Dixon and the Sad Truth and arranged by Ed Goldfarb.

In the Japanese version, the opening and ending themes are the same as those from the first film, "Mezase Pokémon Master '98" (めざせポケモンマスター'98, lit. "Aim to Be a Pokémon Master '98") and "Kaze to Issho ni" (風といっしょに, lit. "Together With the Wind") respectively, with the former being a 2019 remaster of the original and the latter being a new arrangement.

The film received an approval rating of 44% on review aggregator Rotten Tomatoes, based on nine reviews.[13] Paul Asay of Plugged In wrote: "For some, Mewtwo Strikes Back: Evolution will feel extraordinarily nostalgic. Others (read: non-fan parents) will likely be thinking... Meh."[14] Common Sense Media gave the film a three out of five stars, saying: "Whether or not viewers, and Pokémon fans in particular, enjoy this movie is inevitably dependent on how much they like the change to 3D computer animation."[15]

• Official website (In Japanese)
• Pokémon: Mewtwo Strikes Back—Evolution at IMDb