In almost every generation of the Pokémon games, there's a pseudo-clone of the famous mascot Pikachu, most of which are fairly obvious in their imitation. Pikachu itself and its pre-evolution Pichu fill this role in Gens 1 and 2, but in every region afterward, different small Electric-Type rodents have been a common sight in players' journeys to become Pokémon Masters. Although they're not carbon copies of Pikachu, they are all part of the same family.
For almost as long as it's been around, Pikachu has been the face of the Pokémon series. Whether it's the games or the anime, Pikachu has had a prominent presence in just about every piece of Pokémon media there is. In one of the first-ever games, Pokémon Yellow, a Pikachu that detests Poké Balls — much like Ash Ketchum's — is the starter, and it's been a member of every region's Pokédex except for one, Black and White, though players can transfer it over from Gen 4 games. Although another beloved Pokémon, Eevee, has been taking on a similar role in recent years, Pikachu is still practically synonymous with the Pokémon franchise, something that may never change no matter how many clones of it are introduced.
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The clones of Pikachu all meet a few criteria: They're primarily Electric-type, share a similar small size, are modeled after different rodents or similar small mammals, and have round spots on their cheeks where they produce or manipulate electricity. There are other rodent Pokémon, notably the Normal Rodent archetype of monsters that show up fairly early in their respective games, as well as Electric-types similar in size, but there's typically only one clear Pikachu knockoff in each Pokémon region. As members of
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