Koutei Penguin X (
It is similar to Koutei Penguin 1gou. Demonio calls it the ultimate kick because it is stronger than Sakuma's Koutei Penguin 1gou. It doesn't cause recoil to the user but causes damage to the person that gets hit by it.
It was able to break through Endou's Ikari no Tettsui the first time, and scored a goal. However, it was blocked the second time by Endou with Ikari no Tettsui in combination with Shin Nekketsu Punch. Endou used this to change the direction he fell from into the goal to the goalpost.
Later, Demonio used it again and tried to stop Koutei Penguin 3gou with his Koutei Penguin X. He failed however and he was taken by the shot straight into the goal.