I can't seem to decide between Banette and one from the Zubat evolutions.
On the one hand, Banette takes pride in spiting humans and other Pokemon. It lives for the thrill and nor-epinephrine of sneaking about and witnessing other creatures feeling as if they'd faint in their tracks. - Does that make me a bad person?
Then there is the Zubat line of evolution... They can fly, isn't that always a clear benefit? I enjoy dark places; well, I enjoy them when I am not paranoid, and the fact that they're poison based is also a bonus. If the idea of KO by poisoning wouldn't convince something to not mess with me, then there is always the option of Confusion. (: