I heard a rumour that it is either prof. Oak or Giovanni. I think it is Giovanni if it is one of the two becuase that would mean that ash is gary's uncle or fatherO_O. I heard that it was appearantly revealed that ash's mom dated giovanni as a teen. it would make sense considering they never met.
Well I know for a fact it's not Proffessor Oak - Gary is Ash's cousin, and Prof. Oak is gary's Grandfather, so it would be impossible for Oak to be Ash's dad. Thats all I know, sorry.
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