If you mean in Kanto, on Pokemon Gold version, then he should be in Viridian City, just like in the 1st gen games. If he isn't, maybe you need to do some other stuff first.
In her Gym
The Sixth Gym leader is Chuck, he has a Hiryama and a Poliwrath.
In Gold the fourth gym Leader is Morty. Morty specializes in Ghost type pokemon, and his gym is located in Ecruteak city.
The gym leader of Mahogany Town. He uses Ice-type Pokemon. You face him as the 7th gym leader in the game.
Falkner, the gym leader, has flying type pokemon...if i remember correctly he has a pidgey a pidgeotto and a spearow.
8th Gym Leader: Claire8th GYM Leader is Claire of Blackthorn City. She uses dragon Pokemon. Yes indeed Claire is the 8th gym leader in gold/silver/crystal and she uses dragon type Pokemon just like lance
ecruteak city
Blue is the guy you go to if you want to find the viridean gym leader
Talk to the woman outside the cianwood gym after beating the gym leader there
the third gym is in goldenrod city right after ilex forest
The lighthouse is in Olivine City, where the gym leader Jasmine is.
The lighthouse is in Olivine City, where the gym leader Jasmine is.