Tim Goodman, Harry's son, comes to Ryme City in search of his missing father. Upon exiting Tahnti Station, two Aipom cause mischief by stealing a girl's necklace. By chance, Tim encounters his father's Pikachu, who proclaims himself the great Detective Pikachu, discovering that he can somehow understand what Pikachu says. Together, Tim and Pikachu chase down the Aipom with the necklace into Tahnti Park, and work together by interviewing both people and Pokémon to recover the necklace and return it to its rightful owner. Pikachu then shows Tim to his appointment at the Baker Detective Agency, where Tim learns that his father was investigating Pokémon incidents prior to his disappearance.
