Board Thread:Questions and Answers/@comment-1577342-20150619232645/@comment-4630033-20150621045436

I got a Rare T-Rox by breeding a normal one with a Riff on Air Island, and likewise I got a Rare Thumpies (normal one + Deedge) on Cold and a Rare Reedling (normal one + Scups) on Water, so it does work.

It won't, however, work with quad element rares (except the Deedge on Shugabush), but as you can breed the common with the equivalent rare - when you get it - you can easily get more.