Poké Kid is a Trainer Class introduced in and exclusive to Generation IV. They are young girls dressed in Pikachu suits and have the same overworld sprite as a Pikachu. In battle, they use Pichu and its evolutions.
|DPPt/HGSS Battle Sprite|
In a house full of Pikachu on Route 222, a Poké Kid disguises herself as a Pikachu and can be battled if spoken to. This is similar to how Voltorb, Electrode, and Foongus are sometimes found disguised as a Poké Ball.