O's Ambipom

Ash caught Ambipom as an Aipom in the Battle Frontier arc, but it had appeared in a few previous episodes, causing Ash trouble by stealing his hat. This eventually provoked Ash into battling and catching Aipom during the Grand Festival. However Aipom still continued to steal Ash's hat whenever it seemed jealous of Pikachu's bond wtih Ash.

Later, in the Battle Dimension series (season 11), after being advised by their friend Zoey, Ash traded his Aipom to Dawn for her Buizel, as Aipom loved contests, while Buizel likes to win but never wins. It is the second Pokémon Ash ever traded. Soon after Dawn received her, while in the Solaceon Ruins, Aipom evolved after using Double Hit in order to defend Dawn from the enraged Unown.

Then on their way to Snowpoint City, Dawn and her Ambipom competed in the Pokémon Ping-Pong. After the game, Ambipom left with the Champion because she liked Pokémon Ping Pong better than contests. Ambipom has not been seen since

Moves

 * Swift
 * Double Hit
 * Focus Punch
 * Double Team

Trivia

 * Dawn's Ambipom is confirmed to be female.
 * Her Ambipom shares many similarities with Ash's Primeape, both Pokémon took Ash's cap away and were later given to training. Another thing similar between them is that they are monkey-like pokemon. Also they were both sent into training. Primape forboxing, and Ambipom for Ping Pong.
 * Ambipom previously belonged to Ash while she was an Aipom.
 * Ambipom is good at Pokemon Ping Pong.

Ambipom de Dawn/Maya