From the Super Mario Wiki
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They are found in the Energy Hold. They can vary in size just like their weaker cousins and have the ability to produce shock waves with their club. They can also spit out yellow balls that they use to whack at either Mario or Luigi. However, Pwallops can sometimes miss the balls when they swing their club. When Mario or Luigi attacks a Pwallop, it grows either one or two times its size.
Mario & Luigi: Bowser's Inside Story / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
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