After you get 7 badges go to Cinnabar Island and talk to blue (go to the left of the Pokemon center).
If you see him before you defeat Blaine, Blue will not fight you. he will ask you to fight Blaine and defeat him. then go back to cinnabar, talk to Blue, and he will ask u to go to the gym and fight him.
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
Giovanni Is The 8th Gym Leader In Kanto, And He Is The Leader Of The Evil Organisation, Team Rocket.
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
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.
defeat all the other gym leaders
You need to have defeat the other gym leaders of Kanto first, after that you will find Blue on Cinnabar Island, talk to him and he will return to his gym.
It is Giovanni, the team rocket leader. He's in the Viridian City Gym. Its rumored he murdered the previous gym leader, Blue.
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
Giovanni Is The 8th Gym Leader In Kanto, And He Is The Leader Of The Evil Organisation, Team Rocket.
beat the other 7 gyms in kanto and talk to the 8th gym leader on cinnabar island. he will leave and go back to the gym
Blackthorn city, in kanto you find him at cinnibar island show him your 7 kanto badges to make him go back to the gym then you can battle him.
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
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.
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
nothing
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.