Technically, there is no twelfth gym leader. You can face all of the Kanto gym leaders out of order, so there is no real twelfth gym leader. However, if you are going by chronological order of the gyms as they were originally designed, Erika, the fourth gym leader, is in Celadon City.
In the goldenrod gym.
Cinnabar Island.
He is not a gym leader. He is the strongest CPU Pokemon trainer in the Pokemon story. Climb to the top of mount silver and he will fight you.
in eutreaka city with the fourth gym leader morty, go to the pokemon center and he should be there
u need to push the snowballs around and find a path to her like to pryce the seventh gym leader in pokemon soulsilver and heartgold
you cant find celebi in soulsilver
In the original Silver game, the gym leader was Blue and you would find him at Cinnabar island. After meeting him there, you can go back to the gym and fight him.
Firstly, have to defeat the 7th gym leader. Then you go talk to the trainer next to the Pokemon center on Cinnabar Island. He is the 8th gym leader of Kanto, Gary. Gary is in Viridian City.
Hey I have growlithe in soulsilver get in GTS
You fid him back in his gym in veridian city. The place where Giovanni use to be
as so as you find the first switch the secound switch should be write next to it.
Dusclops can be found in the Safari Zone in Pokemon Soulsilver. The rarity varies.