Board Thread:Questions and Answers/@comment-1577342-20150619232645/@comment-24577221-20150621030135

And an update: Maw + Noggin usually works to give a T-Rox, but does fail occasionally. So yes, if you have a T-Rox, your most efficient way of trying to get a Rare T-Rox is to breed your regular T-Rox with a Noggin.