Electro Ball

Electro Ball is an Electric-type move that is seen in Pokemon the Series XY. It is one of Ash's Pikachu's main moves. Electro Ball is a unique move that gets stronger the faster the user is. However, this trait is never exploited in the anime.

Ash's Pikachu
When Pikachu charges up Electro Ball, it uses it's tail to gather the energy and when it is gained, it will launch the Electro Ball as a projectile.