The Viridian Gym leader (Blue) is at Cinnebar Island, you can go there by Surfing south from Pallet Town. If you want him to return to his Gym you have to beat the other 7 Gym leaders in Kanto
He's at Cinnabar Island.
In the beginning of the game, he isn't there. Towards the end, you will find his rival on cinnabar island by himself. After you talk to the rival, he leaves to go back to viridian. Fight the cinnabar gym leader, go back to viridian and the gym leader should be there. The man you talk to on Cinnabar Island Isn't the gym leader, but his rival. After you speak with his rival on cinnabar, the gym leader reappears in viridian. You have to fight and beat the cinnabar gym leader first.
Blue, the Viridian gym leader(looks like your rival for Pokemon FireRed/LeafGreen), is on Cinnabar Island. Talk to him and he'll say a few things, then go to his gym in Viridian City.
You can't. You have to go to the viridian forest.
I know in Soul Silver your can only get him in the Viridian Forest . Pretty sure it is the same for Heart Gold
The last gym leader Blue is first at cinnibar island talk to him so that he returns to his gym go to viridian city and go into the gym battle Blue to receive the last badge.
In Pokémon HeartGold, the Gym Leader of the Viridian City Gym is called Blue and he can be found on Cinnabar Island however he will not leave the island until after you have received all seven Gym Badges in the Kanto region. Blue's party consists of Pidgeot, Rhydon, Gyarados, Machamp, Arcanine and Exeggutor.
you can find it in the ciann city pharmacy
he is found in cinnabar island on gold, silver, and crystal versions. on soul silver and heart gold he's in his gym after u fight all 7 others before him. brock, misty, lt. surge, erika, janine, sabrina, and blane.
In Blackthorn City.
ecruteak city
in poo land.