"It charges itself with electricity more easily on days with thunderclouds or when the air is very dry. You can hear the crackling of static electricity coming off this Pokémon"
Johto did a lot of things for Pokemon, but one of the oddest ones was coming up with "baby" Pokemon. Or, pre-evolved forms of existing Pokemon. Some saw this as a simple money-making tactic, especially when it came to Pichu. Pikachu was already popular, but then to add a possibly cuter form of it? That just screams money. Funnily enough, Pichu was one of the first Johto Pokemon in Pokemon Go.
Pichu's Basic Attacks are Quick Attack and Thunder Shock, while its Special Attacks are Thunderbolt, Thunder Punch and Disarming Voice.