No way, unless you hack it.
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There are only a few ways to get a Snivy in Pokemon Black:1.) Obviously, you can choose Snivy as your starter Pokemon in the beginning2.) You can go to the Global Trade Link (which can be accessed in any Pokemon Center on the 2nd floor) and trade one of your Pokemon for Snivy OR you can trade a pokemon for either a Servine or a Serperior and breed it to get a baby Snivy.
Snivy evolves at level 16
It is one of the three starter Pokemon
oshawott snivy tepig
you suck it doest