Board Thread:Dragon City Questions and Answers/@comment-7786734-20130420025027/@comment-3999279-20130510062448

Jens Ingels wrote:

I already got your answer, if you breed those dragons together with a rating higher than 50 your chance will decrease. This make the Hot Metal Dragon indeed hard to breed. Try this: Electric Level 4 + Metal Level 4 for a 50% chance to obtain the dragon.

Is impossible that formula you gave. He must try Electric+Flame, no Electric+Metal.