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Because that was used in filler against Pikkon, and it is non canon. However, I would think that even if he used it, he still could not win because even he stated he could not, and only Gohan could. Plus it puts tremendous strain on your body, and could even kill you, so I would think as a Full Power Super Saiyan, perhaps Goku did not want to take the risk, however that is just purely speculation on my part.

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