Question

How Likely (In Percentage please) is it of finding a Cryogonal Is Twist mountain In Pokemon Black 2?

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Answer 1

At Twist Mountain, there is a 5% (1 in 20) chance that you will find Cryogonal Lv. 57.

However, in Winter it is a 15% (1 in 6.75) chance that you will find Cryogonal. You can find it a Lv. 57 as well as Lv. 56.

Hope I helped. :)
Hope to my source, my sourcy sourcy source.

Answer 2

15 % chance during winter and 5 % chance during the rest of the seasons.
Source: http://bulbapedia.bulbagarden.net/wiki/Twist_Mountain#Pok.C3.A9mon_Black_2_and_White_2