As Ash and company decide to rest in the city, they let all of their Pokemon out to relax. While Pikachu and the other Pokemon are enjoying their free-time, Ash, Misty, and Brock go to "get something ready". On the top of another neighboring building, Pikachu spies two small Pichus in a slight dilema. Eager to help, Pikachu rushes to help them and is instantly swept up in their strange adventure.
When a street-smart FBI agent is sent to Georgia to protect a beautiful single mother and her son from an escaped convict, he is forced to impersonate a crass Southern granny known as Big Momma in order to remain incognito.
Upon learning that he has to come out of retirement to steal 50 cars in one night to save his brother Kip's life, former car thief Randall "Memphis" Raines enlists help from a few "boost happy" pals to accomplish a seemingly impossible feat.