Short and to the Punch!
While on the way to the next contest town, Gible falls in a river. Buizel saves it. This attracts the attention of a trainer, who wants to have a battle between Buizel and his Mr. Mime. Ash agrees. Mr. Mime proves to be too strong for Buizel though. Following this loss, Buizel is determined to get stronger and defeat Mr. Mime.
Aired 14/01/2010EP 159 - Short and to the Punch!

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.