Pokemon Best Wishes! Season 2: Decolora Adventure - episode 15 - 14 Aug, 2013

The appearance of Woodate Comet approaches, so Ash, Iris, Cilan, and Alexa go stake out the ruins where the legendary hero it is named after first spotted it. However, they must deal with several Ghost Pokémon and Team Rocket who are once again trying to capture Pikachu. (Source: Wikipedia)