Pikkon successfully used Thunder Flash attack twice on Goku in the same fight.
English
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Filler doesn't count sorry. Non canon.
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According to toriyama it is.
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Its not in the manga. Sorry. According to Akira its not. And even so Goku studied Pikkons attack that seemed unstoppable at first and found a weakness to exploit it...[spoiler]smart fighter[/spoiler]
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Yeah getting bashed twice by the same attack before figuring it out is real smart.
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It is when it seems nearly incapable of being countered.