No, but if you have a Ditto, and others have an evolution of Oshawott (Oshawott, Dewott, or Samurott), then you could trade a pokemon for that evolution of Oshawott. Then you must leave Ditto and the evolution of Oshawott in the daycare together for a while. Then talk to the day care man and he will give you the Oshawott egg.
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Oshawott evolves to Dewott on level 17 (Dewott evolves to Samurott on level 36)
You can't catch it in Black, but you can catch it in White. In the White Forest.
So far, in Japan, he has Pikachu, Oshawott, Tepig, Tranquill, Snivy, Scraggy, and Swadloon. In the USA he has Pikachu, Oshawott, Tepig, Snivy, and Pidove.
Black and White Episode 3 A Sandile Gusher of Change Episode 662
Snivy, Tepig, and Oshawott are the starter main Pokemon. The legendry Pokemon is Reshima. Hope I have helped.