What is Pikachu classified as in Pokémon species descriptions?

Pikachu is classified as the Mouse Pokémon in official species descriptions.

Pikachu is an Electric-type Pokémon with yellow fur, red cheek sacs, and a lightning-bolt-shaped tail. Its name combines Japanese sound-symbolic words associated with sparkling electricity and a mouse's cry.

Pikachu was designed by Atsuko Nishida, with the final design credited to Ken Sugimori. It first appeared in the original Pokémon games and later became the franchise mascot through the anime, merchandise, cards, and promotional events.

“Electric Mouse Pokémon” is a common informal description, but the canonical species category is simply “Mouse Pokémon.” Pikachu later gained a pre-evolution, Pichu, in Pokémon Gold and Silver.