Board Thread:Dragon City Gameplay Questions & Answers/@comment-7100451-20130605075401/@comment-1158461-20130605114850

Alright, just gonna cut in here and clear facts up real fast.

The Pirate Dragon and Soccer Dragon combo DOES give a chance of a Legendary Dragon, but as John pointed out, the odds aren't 100%. You'll have a lot of potential combinations - Dark/Fire, Dark/Ice, Water/Fire, Water/Ice and Legendary. The reason it gave you Legendary is because they are both Rare Hybrids.

CyBeR points out that breeding Legendary dragons will give more Legendaries. From what I know, this is actually dead wrong - the Legendary element is a wild card, so it could have been any combination of elements.

Vladi got it right by saying he bred two Legend Dragons and got a Pure. He was pretty darn lucky therewith, though, as he had roughly the same odds of getting that Pure dragon as he did of getting that first Legendary.