Familiarity Breeds Strategy!
After defeating Conway, Ash has now progressed to the Top 8 in the Sinnoh League, and it's finally time for him to go up against Paul in the Sinnoh League battle promised after Monferno's evolution. With the return of Gliscor, Ash decides to use the same Pokémon he used in his full battle with Paul at Lake Acuity, determined to show that they have grown considerably since then. The time has come; will Ash finally be able to defeat the rival he made when he first set foot in the Sinnoh Region, and progress even further in the tournament?
Aired 05/08/2010EP 186 - Familiarity Breeds Strategy!

Pokémon the Series: Diamond and Pearl
After defeating Brandon and declining the offer to be a Frontier Brain, Ash sets off to travel through the far away land of Sinnoh. Once he gets there, he meets up with Hikari, a local trainer from the region, and they decide to travel together.