Oaknapped!

Synopsis
Ritchie arrives at the Professor Oak's lab looking for advice on how to evolve his Eevee. However, the professor is on Seafoam Island getting ready to film a live TV show. Tracey decides to call Oak instead, but his co-host Mary picks up instead. Mary informs him that the professor has gone missing. Tracey and Ritchie then travel to Seafon Island where, along with Mary and Officer Jenny, they try to solve the crime. What they don't realize is that Butch and Cassidy have kidnapped Oak, so Professor Namba can interrogate him about the mysterious life from Pokerus.