Which Pokemon can only be caught in autumn in black 2?

Question

Is there any Pokemon in black 2 that are autumn only?

Answer 1

This site should help you.
http://www.serebii.net/blackwhite/seasons.shtml

Comments

he's asking B2 not Black

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it's the same in black 1 and black 2.

Answer 2

There are no Pokemon exclusive to autumn, unless you count Autumn Form Deerling on Routes 6 and 7. If anything, this season actually limits your encounters: Muk can only be found in the Castelia Sewers when it's full of water, but the sewers are drained in autumn.

Seasons (Bulbapedia)