okay..calm down. It's totally subjective.
You answered your own, rather insulting question:
a) Cosmic Pyrokinesis means that she can control the universe at the subatomic level. Jean alone is known to be able to do that. Subatomic level means that she could kill with a thought or by waving her finger. She can disintegrate you at the speed of thought.
b) Temporal manipulation means that she can start and stop time as she wishes. She has fully control of time in any aspect
c) I don't know if you're trolling, but Jean Grey with the Phoenix is a Cosmic Level entity far beyond that of Galactus. Saying that she's 'just a mutant' shows you haven't a clue what you're talking about. During the Dark Phoenix saga she wiped out a whole galaxy in an eye blink by absorbing a star.
d) Since when did Goku ever deal with a Telepath? He's not the brightest guy in the Universe, that alone may cause problems for him.
We're talking about the Phoenix here. Or if you meant Jean without the Phoenix, that's a separate matter. As normal Jean, she wouldn't have a hope in hell.
Just because I disagree with your.... reasoning doesn't mean I'm either a particular fan of Jean Grey, nor does it mean I dislike Goku.
If Goku is going to win all the time, what's the point in asking the question in the first place?
It's like asking who would win vs Batman. It's pointless, especially if you won't take reasonable argument to the contrary.