The seventh gym (Blaine's) used to be on Cinnabar Island. After the town was destroyed by the volcano, Blaine has relocated his gym to the Seafoam Islands. Just Surf east of Cinnabar, and you will reach him.
mahogany town
go to the seventh leader. -_-
An old guy called Pryce, who specializes in ice pokemon.The seventh gym leader is Pryce in Mahogany town.
by beating the icicle gym leader. In mahogany town.
its on seafoam island go up the ladder
Go to the lake of rage and either KO or catch the Red Gyardos
You have to beat team rockets warehouse in mahogony gift shop.
well you go to the place where they make you the new chapion
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
Yes, beating the 7th Gym does not effect getting the secret potion.
the seventh gym is at sekka city
The 16th gym is the Viridian City Gym.