Metapod

Metapod (トランセル Transel) is a -type Pokémon that evolves form of Caterpie starting at level 7. Metapod can evolve into Butterfree starting at level 10.

Appearance
Metapod is a insect-like Pokémon with an appearance similar to that of a green colored chrysalis or cocoon. Though it is covered in its hard shell, Metapod's eyes are still clearly visible and usually appear dazed or drowsy.

Special Abilities
All Metapod have the ability Shed Skin which allows for a 1/3 chance that a harmful status effect will be dropped every turn.

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.

In Anime
Metapod first debuted in the Pokémon Anime episode Ash Catches a Pokémon when Ash's Caterpie quickly evolved into a Metapod near the episode's end.

In the episode Challenge of the Samurai, Ash battled a Samurai-like trainer using his Metapod against the Samurai's Metapod.

Gym Leader Bugsy used his own Metapod against Ash in the episode Gettin' The Bugs Out. This Metapod proved to be more capable than others in previous episodes as it was actually able to knock out Ash's Chikorita.

In Game
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 Butterfree when raised past experience level 10.

Generation I
Main article: Metapod/Learnset Generation I

Generation II
Main article: Metapod/Learnset Generation II

Generation III
Main article: Metapod/Learnset Generation III

Generation IV
Main article: Metapod/Learnset Generation IV