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
in viridian city
Viridian city
He is on Cinnabarr Island.
The last gym is in viridian city
Defeat the viridian city gym leader Blue.
Blackthorn if you are including Kanto its Viridian Pokegamer01
Blue is the Viridian City Gym Leader (Badge #16)
on cinnibar island beat the 7th gym 1st tho
Just north of Viridian City in Kanto
you have to find it in viridian forest
He is the gym leader Viridian city
south of viridian city