DP040: Top-Down Training!

Episode Plot
While Ash and co. are at a Pokémon Center and watch a battle between Cynthia the Sinnoh League Champion and Lucian, member of the Sinnoh's Elite Four, they hear that Cynthia is nearby. When they finally meet her, Paul appears and challenges her to a six on six battle. Cynthia agrees and the battle starts. Will Paul be able to win Cynthia and her strongest Pokémon, Garchomp?

Debuts
Human Debuts Pokémon Debuts
 * Cynthia
 * Garchomp
 * Torterra

Trivia

 * This is one of the few episodes of the Diamond & Pearl series in which Dawn's Piplup doesn't appear.