Regaining the Home Advantage!
On the way to Dawn's next contest, Ash and friends encounter a Magnezone in a forest. The Magnezone is enraged and is quickly heading for a nearby town, so Ash and the others try to stop the rampaging Pokémon before it makes it to the city.
Aired 07/01/2010EP 158 - Regaining the Home Advantage!

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.