How to breed Leviathan Dragon in Dragon City?

Solution 1:

A quick google search will find you this site:Leviathan Dragon.

To breed the Leviathan Dragon, you will have to use a sea hybrid and a war hybrid to get it. Below are some combinations that will give you a shot at this rare hybrid.

Colossal(War+Terra) + Mercury(Sea+Metal)

Nenufar(Sea+Nature) + Juggernaut(War+Flame)

Red Woods(War+Nature)+Plankton(Terra+Sea)

Red Woods(War+Nature)+ Waterfall(Sea+Terra)

If you would like to see the full breeding chart, click here.

Solution 2:

By breeding the double sea dragon (if you have it) with the war dragon, you should get a leviathan dragon with a 100% chance success.

The chances of getting a leviathan are quite low in general, and options from other answers could work, but the chances of getting one are quite rare (considering the dragon is very rare).