Metapod is an insect-like Pokémon with an appearance similar to that of a green colored chrysalis or cocoon. Although it is covered in its hard shell, Metapod's eyes are still clearly visible and usually appear dazed, drowsy, or angry for reasons unknown. A Metapod's exterior is regularly hardened to protect its soft and tender innards while undergoing metamorphosis to eventually become a Butterfree. To conserve energy for this event, the Metapod barely moves.
This Pokémon is vulnerable to attack while its shell is soft, exposing its weak and tender body. The shell covering this Pokémon's body is as hard as an iron slab. Metapod does not move very much. It stays still because it is preparing its soft innards for evolution inside the hard shell. pokemon.wikia.com/wiki/Metapod
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