Electro Yo-Yo is the 6th Guardian you see in Blasterball 3. It's encountered on Stage 60 and is basically an improved version of Plasma Yo-Yo. Electro Yo-Yo moves more erratically than its predecessor, making it harder to hit. It also summons Zappers to get in the player's way.
In a similar fashion to the Plasma Yo-Yo, it only has one attack, which is to drop down and zap the Paddle, giving Inertia physics and thus making it difficult for the player to control the Paddle.
If the ball hits the Zappers, a ball of lightning will fall down rapidly across the screen, and if the orb hits the paddle, the latter will be also given Inertia.