Bullet Bill Blast
From the Super Mario Wiki
Bullet Bill Blast is Shy Guy's Skillshot in Mario Strikers Charged. Once fully charged, Shy Guy jumps on a Bullet Bill and heads toward the goal. It will explode, knocking out every character within blasting range, including Shy Guy and the Kritter. Shy Guy, however, recovers earlier than all the other characters, including the goalie, and has the opportunity to kick the ball into the goal.