I wouldn't be surprised if someone has done it or if there are Zoroarks that posed as them at their just for kicks. You could imagine the confusion not to mention, if they can talk it would harder to prove who is the pokemon.

With Wonka, its generally a good way to gauge a person, some people naturally give it off and she warms up to them a bit fast. [Wonka is a little messed up.] Now my Absol, she can normally tell when something is up if I have her out before hand.