Better sorry if I'm coming off as a jerk I just don't think people should use the word retard in that way because there are people with mental disabilities and it isn't their fault that's just how they were born and they shouldn't have to feel insulted or ashamed of something that they have no control over.
It's actually a pretty useful move. You should use it after the opposing pokemon uses a non-offensive move (e.g. Light Screen). It gives you free reign to set up/implement your strategy without any trouble.