From the Super Mario Wiki
Bullet Bill Blast is Shy Guy's Skillshot in Mario Strikers Charged. Once fully charged, Shy Guy will jump on a Bullet Bill and head towards the goal. It will explode, knocking out every character in within blasting range, including Shy Guy and the Kritter . However, Shy Guy will recover earlier than all the other characters and will be able to kick the ball into the goal. But, the other characters recover shortly after, so it is easier to just get another player who was not hit to come and kick it in. This skillshot is one of the hardest to master, as Shy Guy knocks himself and his partners out.
||Frappe Bill Balle