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Alola Raichu's bizarre "fluffy pancake" thing is a reference to a well-known Japanese storybook called "Again! The Mouse and the Pancake!"
What the hell it has to do with him mutating into a psychic surfer is beyond me, but that's the meaning of the pancake line. It would be like if a western-made game used the line "maybe people gave him too many cookies?" or something.
