It is unskilled at storing electric power. Any kind of shock causes it to discharge energy spontaneously.
Despite this Pokémon’s cute appearance, those who want to live with one should prepare to be on the receiving end of its electric jolts.
Pichu stores electricity in the sacs on its cheeks but discharges it inadvertently when agitated or excited. Being yet immature, the Pokémon’s handling of electricity is rather inept.