Coral Dragon

Breeding
This dragon can be bred from a Water Dragon and a Plant Dragon at either the Breeding Mountain or the Ultra Breeding Tree.

This combination can also result in a Nenufar Dragon. And you will have to breed twice or try your luck

Damage Calculator
To explain, when attacking with Water, Coral deals double damage against Fire and Electric, medium damage against Water and Ice, and no damage against Plant. When attacking with Plant, Coral deals double damage against Electric and Dark, half damage against Water and Plant, and no damage against Fire. When defending, Coral takes double damage from Earth and Ice, half damage from Plant and Dark and take no damage from Water.