Ken Watanabe has joined the cast of the upcoming Detective Pikachu movie. The Hollywood Reporter revealed Watanabe will star in the Pokemon spin-off being directed by Goosebumps and Shark Tale alum Rob Letterman. Watanabe's character is named Detective Yoshida, and will star alongside Ryan Reynold's Detective Pikachu, whose role is set to involve some form of motion capture. The script has already been penned by Guardian's of the Galaxy screenwriter Nicole Perlman and Gravity Falls' creator Alex Hirsch. Continue reading…