Jack (Japanese: ジャック Jack) is one of the characters of Detective Pikachu. He is Tim Goodman's childhood friend from Leaventown and is portrayed by Karan Soni.
At the beginning of the movie, Jack tried to assist Tim in catching a wild, lonely Cubone. However, the attempt went awry and the Cubone broke free. When Tim left for Ryme City after hearing his father Harry's death, Jack remained in Leaventown.