Pikachu (ピカチュウ Pikachū?) is one of the fictional species of Pokémon creatures from the Pokémon media franchise—a collection of video games, anime, manga, books, trading cards, and other media created by Satoshi Tajiri. As do all Pokémon, Pikachu fight other Pokémon in battles central to the anime, manga, and games of the series. Pikachu is among the most recognizable Pokémon, largely because a Pikachu is a central character in the Pokémon anime series. Pikachu is widely considered the most popular Pokémon, is regarded as the official mascot of the Pokémon franchise, and has become an icon of Japanese culture in recent years.
In the Pokémon franchise, Pikachu are often found in houses, forests, plains, and occasionally near mountains, islands, and electrical sources (such as power plants), on most continents throughout the fictional world. As an Electric-type Pokémon, Pikachu can store electricity in its cheeks and release it in lightning-based attacks.
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Wikipedia]
Also pikachu hat is glorious.
Also this.