It is great to see so many getting this one, and quickly too! I got it on my third try using Diamond and Olympus, Diamond Temple activated, and boosted breed. Will probably speed this one up so I can try for other diamond hybrids while my temple is active.
I wondered when I clicked on boosted breed if that was a bad idea as it helps you get rare and super rare dragons, not ultra rare.
Good luck to all who are still trying!