Metapod

Metapod (トランセル Toranseru?, Transel in original Japanese language versions), known as the Cocoon Pokémon, are pupal Pokémon found in the wild early in the Kanto and Johto regions, of which its larval form is the caterpillar-like Caterpie. In main series Pokémon games set in these regions, Metapod are among the earliest and easiest Pokémon species acquired by players, either by catching one in the wild or training a Caterpie past experience level 7 and evolving it into a Metapod. They can evolve into the butterfly-like Butterfree when raised past experience level 10. A Metapod's exterior is regularly hardened to protect its soft and tender innards while undergoing metamorphosis to eventually become a Butterfree.[36] To conserve energy for this event, the Metapod barely moves.[37]