From the Super Mario Wiki
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Egg Swing is Yoshi's Star Swing in Mario Super Sluggers. Yoshi will lay a Yoshi Egg and hit it. It will bounce around the field in a similar fashion to Waluigi's Liar Swing, and it will have a rainbow trailing after it. Once the egg comes to a stop after two or three bounces, it will disappear and the ball will take its place.