Ekans

Ekans is a -type Snake Pokémon introduced in Generation I.

Physiology
Ekans is a snake-like Pokémon with purple and yellow coloring. Its underside leading to its tail is yellow, and it has a yellow rattle at the tip of its tail. Ekans have large yellow eyes with slit reptilian pupils. Across its neck is a large yellow band.

Special abilities
Ekans, like real snakes, have the ability to unhinge their jaws, giving them the ability to swallow prey whole such as Pidgey, Spearow or their eggs. Ekans also share other characteristics with snakes, such as using its tongue to test the air for the presence of prey and shedding its skin. An Ekans will lose its rattle once it evolves into Arbok.

Evolution
Ekans evolves into Arbok at level 22.

Anime


Ekans first appearance in the anime was in the episode Pokémon Emergency!, where it was revealed to be Jessie's Pokémon.

Ekans was widely known for being under the ownership of Jessie, a member of Team Rocket, who had received it on her birthday. It later evolved into an Arbok in the episode Dig Those Diglett!.

An Ekans also appeared in "Team Go-Getters out of the Gate!" as a member of Team Meanies.

Trivia

 * Ekans is the first pure Poison Pokémon in the National Pokédex.
 * Ekans's and Arbok were originally planned to be called their Japanese names "Arbo" and "Ekan" (which was planned to be a used word but never released), in the English versions, but their names have changed.
 * It was shown in "Pokémon The Power of One" that Ekans can swim.
 * Ekans is "Snake" spelled backwards, just like Arbok, Ekans evolved form, is "Kobra" spelled backwards, but with a k instead of c.

Names in other languages
Ekans appears to be based on a snake.

Ekans' English name is the word "snake" spelled backwards. Its Japanese name, "Arbok", is either the backwards spelling of "cobra" without the "c", or it is a mistake made on the word "boa" when spelled backwards.
 * French: Abo
 * German: Rettan

アーボ