Volcano Dragon

Breeding
You can get this dragon by breeding a Fire Dragon with an Earth Dragon at the Breeding Mountain or Ultra Breeding Tree. Breeding a Fire Dragon with an Earth Dragon may also result in a Flaming Rock Dragon.

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

Counter Dragons
These are dragons that are best suited to defeat this dragon in Combat and there can be any number of good counter dragons:
 * Gold Dragon

Trivia

 * For unknown reasons, it is called Vulcano Dragon instead of Volcano Dragon.
 * Vulcano Dragon or Volcano Dragon is the robust cousin of Alpine Dragon, it has no change from baby to adult between Alpine and Vulcano.(or Volcano Dragon.)