In Pokémon 4Ever, Celebi, a legendary Pokémon, exhausts its remaining energy to travel to the present day, fleeing from a ruthless Pokémon hunter. It takes Sammy, a young boy dedicated to its protection, along for the journey. Joined by Ash, Pikachu, and their friends, they face a new, formidable adversary who poses a greater threat than the hunter. Together, they must fight to safeguard their forest and ensure Celebi's survival, as the fate of their home rests in their hands.