Metaceus's cocoon is said to be made of materials more ancient and durable than any naturally that are occurring on the planet. Analyzing them has proven difficult, as once Metaceus evolves, the cocoon dissipates completely into dust.
Metaceus's shell is resistant to many attacks and environmental factors. If threatened enough or its environment is too unfavorable, it will search up to 1000 meters for a new spot to wait for evolution.
