Definition from Wiktionary, the free dictionary
Pikachu (plural Pikachu or Pikachus)
- (trademark, video games, anime, manga) A member of a small yellow mouse-like Pokémon species that has red cheeks and a tail shaped like a lightning bolt, and is able to control electricity.
- (trademark) Plural form of Pikachu
For usage examples of this term, see the citations page.
The official Pokémon products and video games use the plural Pikachu, although Pikachus is commonly used elsewhere.