Caterpie

Caterpie is a Bug-type Pokémon from Kanto region. It can evolve into Metapod when fed with 12 candies and its final evolution form is Butterfree.

Pokédex description
Worm Pokémon

''Caterpie has a voracious appetite. It can devour leaves bigger than its body right before your eyes. From its antenna, this Pokémon releases a terrifically strong odor.''

Evolution family
Caterpie is the part of a three-member family.