Thunder Shock

Thundershock is a battle move in the Pokémon video game series. It debuted in the generation 1 series of video games which consists of Pokémon Red and Blue, and later Pokémon Yellow. The attack isn't terribly powerful, though it will be successful every time. You'll be able to use this attack in the video games 30 times until you'll have to go refill it.

Not only will this harm an enemy, though it also has a 10% probability that it'll paralyze the opposing Pokémon as well.

In the Super Smash Bros. series, thundershock is one of Pikachu's and Pichu's standard attacks, thus meaning it's not a special move. Nevertheless, it is a smash attack that can be performed by pressing side-A, while of course at the same time and quickly. It'll inflict a great amount of damage to your opponent - 10%-28% for Pikachu, though only 1-20% for Pichu. It should also be noted that this attack will harm Pichu as well.