Kari's Samurott
Samurott, as an Oshawott is one of Kari's Pokemon. He, along with Tepig, Snivy, Deerling and Zorua, has begged Kari to be a part of her Pokemon team. Oshawott was used in Chance Reaction and defeated Mac's Sandslash and Mac's Camerupt, but was defeated by Mac's Sableye. In the same episode, it was revealed he attacks anything that's red.
As an Oshawott
Over the years had past, he had evolved into Dewott then into Samurott prior to Full Moon's Full Pokemon Journey. He maintains attacking things that are red just he did as Oshawott.
As a Dewott