The shell on its back is just skin that has cooled and hardened. It breaks easily with a slight touch.
Its brittle shell occasionally spouts intense flames that cir culate throughout its body.
Its body is as hot as lava and is always billowing. Flames will occasionally burst from its shell.
MAGCARGO’s shell is actually its skin that hardened as a result of cooling. Its shell is very brittle and fragile - just touching it causes it to crumble apart. This POKéMON returns to its original size by dipping itself in magma.
MAGCARGO’s body temperature is approximately 18,000 degrees F. Water is vaporized on contact. If this POKéMON is caught in the rain, the raindrops instantly turn into steam, cloaking the area in a thick fog.
— Pokédex entries (via PokeAPI)