Title: Togekiss! The Magnificent Battle!! トゲキッス！華麗なるバトル!! 
Air Date: April 15, 2010
Summary: As the Team heads through the plains, its time for Dawn's practice with Togekiss for the Grand Festival. Togekiss is very much excited to show its elegance, but tries to showcase its look by taking hits of Gible's Attacks. Dawn tries to make Togekiss understand the battle styles with magnificent looks. The situation worsens when Team Rocket shows up, planning to steal Togekiss. 
Source: Wikipedia

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Note: So it seems that Pokemon Diamond & Pearl will indeed end after the summer, sorry folks no Battle Frontier and no Johto revisit. Which means Pokemon Black and White series will start in the fall. I'll probably have another blog post on what I think is going to happen.