Pikachu started getting those royalty paychecks from the show, and the fame went to his head. He lost all that weight. Caught a diva attitude and kicked Misty and Brock off the show. He even managed to kick off their replacements each season. Ash is being held hostage and all of the other Pokemon from each region mysteriously go missing at the start of each new region. Pikachu is an evil Pokemon and needs to be stopped.