Question

How can I get a Contrary Snivy in Y?

Answer 1

You can't.

Snivy's hidden ability is unreleased, the only way to get it is by hacking (as of today.)

Source: (Showdown)

See how "Contrary" is crossed out? That means the ability is unreleased, so it can't be legally obtained.

Comments

I once got a contrary Serperior in a random battle

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that's because HA serperior was released, but not HA snivy.

Answer 2

It's possible, but hard.

The only way to get one is by hacking for one because it was never released. So try to hack or try to find someone who hacked for one.

Sorry for the sad news.

Comments

Snivy was never released in Dream World. None of the starters ever were.

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Wasn't there a Contrary Snivy event in japan?

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I checked and nope it doesnt