Movie
Description
Pr Chen, short for Professor Chen, is the French name for the Pokémon researcher known in English as Professor Oak, and in the film Pokémon 4Ever his story is centered on his younger self, a boy named Sammy. The film presents Sammy as a young Pokémon Trainer from the Johto region who lived forty years before the time of the main series events. He first appears while protecting the Mythical Pokémon Celebi, known as the Voice of the Forest, from a Pokémon Hunter. During the chase, Celebi, badly injured, uses its time-travel ability to flee into the future, accidentally carrying Sammy along into the present era. This displacement sets the film's story in motion, and much of Sammy's early arc involves coming to terms with being stranded in an unfamiliar time.

As a person, Sammy is brave, kind, and quick to act in defense of others, especially Pokémon. He shows natural curiosity about the world and a habit of recording what he sees through drawings, an early expression of the scientific instincts he will later carry into adulthood. He is also sensitive and hopeful, and he holds onto the friendships he forms during his journey. When seen in the present day, Professor Oak displays the same warmth and enthusiasm for Pokémon, combined with a somewhat absent-minded nature, that define him as both a respected scientist and a friendly guide for young Trainers.

Sammy's motivations throughout the story are to protect Celebi, help it recover from its wounds, and find a way back to his own time. After meeting Ash Ketchum, Misty, and Brock, he joins them in taking Celebi to the Lake of Life, whose waters are said to have healing properties. He bonds closely with Ash during this journey, and the two develop an emotional connection that becomes the film's central focus. When the villain known as the Iron Masked Marauder captures Celebi with a Dark Ball and uses its power to create a destructive armored form, Sammy joins Ash and Pikachu in entering Celebi's armor, where their combined trust and friendship help Celebi break free of the Dark Ball's control.

The relationship between Sammy and Celebi is the film's core bond; Celebi trusts him enough to remain by his side and later dies in his arms before being revived by the Voice of the Forest, the collective presence of Celebi across time. His relationship with Ash is equally important, as the two share the experience of being separated from their own time and comfort each other with the hope of reunion. This friendship carries the film's theme that bonds between people can endure across decades. When Celebi finally carries Sammy back to his own era, he promises Ash that they will meet again someday.

The film's final revelation connects Sammy to the present day. After the adventure, Ash, Misty, and Brock speak to Professor Oak over the phone and are puzzled that he seems to know Sammy's name even though they never mentioned it. Alone in his laboratory, Professor Oak opens an old sketchbook containing a faded drawing of a boy, Pikachu, and Celebi, and recalls the events as if they happened recently, confirming that he was the boy Sammy all along. This twist gives Professor Oak a hidden personal history and reveals where his devotion to Pokémon research and his appreciation for the bond between humans and Pokémon began. In his later life, he becomes the renowned Professor Oak of Pallet Town, known for providing new Trainers with their first Pokémon, developing the Pokédex, and serving as a lifelong mentor and researcher. His defining ability, in both youth and adulthood, is an attentive understanding of Pokémon and a talent for observation and record-keeping, represented by his lifelong habit of sketching and documenting what he experiences.