Pokémon Mystery Club
Ken is a member of the Pokémon Mystery Club, abbreviated PMC. Along with his partner, Mary, they try to solve the mysteries of Pokémon origins. They believe that Pokémon came from space, and are out to prove it. Ken's Japanese voice actor is Seki Toshihiko.
Ken first appeared in Wish Upon a Star Shape. A spacecraft carrying Cleffa, Clefairy and Clefable had crashed, and a lone Cleffa had fallen out. Ken and Mary wanted to capture the Cleffa so they could study where it came from. Concerned about what Ken and Mary would do to Cleffa, Ash had his Phanpy take care of Cleffa and make sure it got to its spacecraft safely. Phanpy did its job perfectly, and the Cleffa evolved into a Clefairy so it could get on board the spacecraft as it flew away. Ken and Mary, along with Team Rocket were sent blasting off.
Ken also appeared in Crazy as a Lunatone. He and Mary were now trying to capture a Lunatone and study it. Just like the last time, they were sent blasting off, not getting a single amount of information about the Pokémon they tried to capture.