On cinnibar island below pallet town.
The gym dumby.
beat all the gym leaders
Cinnibar island if your going in order.
Pewter City.
In the 4th gym ! After you beaten the gym leader in saffron city!!
u can find it in Pokemon mansion.
viridian city
in the viridian gym ;)
He is in the Cinnabar Gym on Cinnabar Island.
beat the other seven gyms and come back
If you mean, "how do I unlock the Gym where he is", you have to go into the mansion and get to the basement. There you will find the key to open the Gym
you must find the key to the cinnabar island gym......