Ekans

Ekans is a Poison-type Pokémon from Kanto region. It can evolve into Arbok when fed with 50 candies.

Pokédex description
Snake Pokémon

''Ekans curls itself up in a spiral while it rests. Assuming this position allows it to quickly respond to a threat from any direction with a glare from its upraised head.''

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

Trivia

 * Ekans name comes from word Snake spelled backwards.