Armadillo Dragon

Breeding
You can't breed this dragon directly with an earth dragon and a metal dragon because it will not work. You can breed a to get this Armadillo. You can also get it and cool fire by breeding Medieval Dragon (Metal + Fire) and Alpine Dragon (Ice + Earth).

Below are some of the different breeding combinations.

Medieval Dragon + Alpine Dragon

Medieval Dragon + Snowflake Dragon

Paladin Dragon + Jade Dragon

Medieval Dragon + Mud Dragon

Medieval Dragon + Flaming Rock Dragon

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

Counter Dragons
Fluorescent Dragon Zombie Dragon Medieval Dragon