There is a reason they call them over used, because they are over used. That gives no reason for testing them out just because they're being used more than the others unless you're saying gengar is uber, which I doubt your implying.
Like I said, I have put forth an argument why Garchomp's usage numbers implies that he *might* be uber in the PR threads I mentioned, I recommend you read those. Considering all of the staff's reasoning behind these moves are well stated in the Policy Review forum, if you refuse to read it then there is nothing I can do about it.
Your attitude seems of the "Garchomp is a metagame threat, deal with it" sort - and while it does have a point, I think that kind of attitude destroys the concept behind a metagame which is to create the most competitive multiplayer game possible. Read the PR thread "What do we want in a metagame" thread to see a sample of the responses and to see *why* we are testing them to begin with.