User blog comment:Umishiru/Question For Those Who have Legendary and Poo Dragons./@comment-2068382-20120812150918

http://forums.socialpointgames.com/showthread.php?42265-Simplified-Dragon-Breeding-List-%28with-Breeding-and-Hatching-Time%29

I think this page could help you very much. Note that these combinations are not 100% guaranteed that you will get the dragons you wanted. It all depends on your luck.