Pikachu?

Plusle
The Cheering Pokémon
Type: Electric
Official Registration #: 311
Entry: Contrary to popular belief, not a long-eared pikachu. Its abilities are best used in tandem with minun; otherwise, you have a very cheerful rabbit with the electrical strength of a battery.

Minun
The Cheering Pokémon
Type: Electric
Official Registration #: 312
Entry: Contrary to popular belief, also not a long-eared pikachu. Its abilities are best used in tandem with plusle; otherwise, you have a very cheerful rabbit with the electrical strength of a battery.

Pachirisu
The EleSquirrel Pokémon
Type: Electric
Official Registration #: 417
Entry: Contrary to popular belief, not a long-tailed pikachu. Not to be underestimated. Although its electrical strength by no means rivals the aforementioned pikachu, its tenacity and energy render it intensely difficult to defeat in the hands of the right trainer. Which has made at least one tournament against a certain dragon trainer hilarious to watch. (On the negative side, this also makes pachirisu infestations difficult to control, which is, to be fair, not entirely an issue except for that one time when one noteworthy specimen was responsible for a major blackout in Castelia City.)

Emolga
The Sky Squirrel Pokémon
Type: Electric/Flying
Official Registration #: 587
Entry: Contrary to popular belief, not a flying pikachu. However, just as potentially destructive as one. Fortunately, as buildings provide inadequate surfaces from which to jump off and land, emolga generally prefer sticking to forested areas, as trees are far easier to glide between. Unfortunately, this is of no comfort to anyone who happens to be traveling through the wooded areas of Unova—which is to say, everyone.

Dedenne
The Antenna Pokémon
Type: Electric/Fairy
Official Registration #: 702
Entry: Actually, this one probably is a close relative to pikachu. We’re still doing research into that.