Get a Pegasus Dragon and a Thunder Dragon. The Thunder Dragon's element is Lightning, while the Pegasus' elements are Plant, Cold and Air. It won't be easy to get a Pegasus Dragon because its breeding time is 36 hours while that of the Thunder Dragon is only 12 hours. So you will have to wait more while completing this breeding. But these efforts will be worthwhile because it's a beautiful Dragon with rare properties. In order to breed the Pegasus Dragon, you will need 2 elements: The first one is Lightning, which can be obtained from a Thunder Dragon and the second is Plant, Cold or Air.