The forest here exists in its own time, a place the film actually commits to making you feel rather than just animating. Ash meeting his younger self isn't the emotional core, watching Sammy protect something fragile while Ash learns he already did is. The villain is forgettable, which almost doesn't matter because what you're actually holding onto is the image of that lake, that light, that moment when two timelines touch and you realize the movie is really about the boy Ash used to be asking the trainer he became if he's still worth saving.
A young boy named Sammy rescues a wounded Celebi from a ruthless hunter forty years in the past. The legendary Pokémon's time-warping ability pulls them both forward to the present day, where Ash and his companions find themselves protecting a creature hunted by forces far more dangerous than simple poachers. The Iron Masked Marauder, a rogue Team Rocket operative with advanced technology, will stop at nothing to capture Celebi and weaponize its reality-bending powers. Meanwhile, the familiar troublemakers of Team Rocket pursue the same prize, creating chaos at every turn. Ash must guide Sammy and the injured Celebi through a forest sanctuary before their pursuers succeed in capturing the legendary Pokémon. What begins as a rescue mission becomes a desperate race against time, where the fate of an ancient forest and everyone in it hangs in the balance. The film balances action-packed chases with genuine emotion as Ash confronts what it truly means to protect something precious, even when the odds are overwhelmingly stacked against you.