Short History

  In the first episode of Pokemon Ash Ketchum obtained a pikachu from Profesor Oak. Pikachu has been in every episode of pokemon. Pikachu did not listen to Ash's commands and even shocked him an alarming amount of times. Even tho at first Ash and pikachu didn't get along at first they became best friends.
  Pikachu was originally created by Satoshi Tajiri who is the founder of Game Freak witch is the company that created pokemon. But his original design has changed a lot when the anime started in 1997.

About

Pikachu stores its electricity in its cheeks and releases it from there. It is also know to raise its tail in tall grass and is struck buy lightning.