Lmao that's not an opinion. Goku is a moron period. Having good instincts does not make you smart in any way. The fights he was in and the way he handled himself proves he wasn't a smart fighter. Also lol at people that resort to calling others kid. That's says more about you than me.
Don't get your panties in a wod. Jeez just because he is a smart fighter. He literally studies his opponents as they fight and turns their strengths into their weakness. The same move never worked twice on him in the same fight.
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]