Shy Guys on Pogo Sticks
From the Super Mario Wiki, the Mario encyclopedia
Shy Guys on Pogo Sticks are pogo stick-using Shy Guys that make their first and so far only appearance in Yoshi's Story, where they are first encountered in Rail Lift. Most Shy Guys on Pogo Sticks merely stand in a specific spot and jump over and over.
Unlike Stilt Guys, Shy Guys on Pogo Sticks do not need to be dismounted from their ride to be attacked and thus can be defeated by throwing a Yoshi Egg at the exposed Shy Guy or swallowing it. Also, much like normal Shy Guys, the color of the rider can be changed by Ground Pounding near it.
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