Pokémon the Movie: I Choose You!.

Ash Ketchum wakes up late one morning after having broken his alarm clock in his sleep. He eventually makes it to Professor Oak's lab, but is told that the three starter List of Pokémon (Bulbasaur, Squirtle, and Charmander) have already been taken by Trainers who were on time. However, Oak reveals that he has one more Pokémon, an Electric-type named Pikachu. Despite its volatile and feisty personality, as well as its refusal to get inside a Poké Ball, Ash happily takes Pikachu for his journey.