One of my followers on Tumblr wanted to see a Snivy... I'll admit, Heart Gold and Soul Silver were the most recent games I've played (I've never even played the other Gen IV games!), so Snivy was a new face to me. I looked it up, and it just looked so wonderfully -smug- that I had to do something.
I wouldn't depend solely on that Occa Berry if I were you, there, little Snivy... unless your trainer was quick on the B button all the way up, the level difference might be a bigger hurdle than the type advantage! :B