Its stubborn nature is matched only by its steely resolve, and it is said that nothing can stand in its way when it sets its mind to a task. The rust-colored metal of its body is constantly heated by the coals and firestones it consumes, and its eyes glow yellow from the intense heat. Rustank's ears, tail, and mane are made of pipes that can unleash hot steam or smoke, and it can use the openings on its abdomen and legs to release bursts of scorching heat.

Forge Armor:

Description: When this Pokémon is hit by a Fire-type move, it gains a boost in Defense and Special Defense. The boost amount is equal to half of the damage taken from the Fire-type move, rounded down. Additionally, this Pokémon takes reduced damage from Fire-type moves.
Specifically, Pokémon with the Forge Armor ability receive a 50% reduction in damage from Fire-type moves. When hit by a Fire-type move, they also gain a boost in their Defense and Special Defense stats. The amount of the boost is equal to half of the damage taken from the Fire-type move, rounded down.