The Eighth Wonder of the Sinnoh World!
Ash and friends return to Sunyshore City and Ash is excited to finally get the chance to battle Volkner to try and win his eighth and final badge. Will Ash be able to defeat Volkner and finally be able to qualify for the Sinnoh League?
Aired 03/06/2010EP 179 - The Eighth Wonder of the Sinnoh World!

2006
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.