u will find him on Cinnabar Island near the northern side. But he won't battle you until you beat Blaine over at Seafoam Islands. hen go talk to him and he will return to his gym where you can then battle him.
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If you are talking about the 8th gym leader in Johto, you go to New Bark Town, surf east, and go to the Pokemon League. If it's the 8th gym leader in Kanto, go to Saffron City to receive a Hoenn starter from Steven Stone.
Giovanni Is The 8th Gym Leader In Kanto, And He Is The Leader Of The Evil Organisation, Team Rocket.
defeat all the other gym leaders
you have to use the HM surf and surf behind the gym and go in the cave. go to the other side of the dragon temple and go in. awnser the old man's questions and the gym leader will come in and give you the badge. This is to get the 8th Johto gym badge. To get the Kanto one search: how do you get to the 8th Kanto gym badge
The answer is simple: defeat the 7th gym leader. That would be Blaine, who is found in the Seafoam Islands. Defeat him to gain access to the 8th.