The 9th Gym would be Vermillion. It's the standard Vermillion Gym puzzle, search through the bins till you get a switch, the second one will be next to it. (Up, Left, Right or Down) - The Gym Trainers will take you this when you defeat them. It might take a few attempts, but it's not difficult.
beat it
vermilion city once you've beaten the pkmn league. take the ss aqua from olivine to get there.
defeat all the gym leaders in johto and kanto hope this helps
They are in the garbage cans
in his gym
seafoam islands; 15th gym
In the gym!
no
surf through passage ways in front of the island
The fourth gym leader in Pokemon Soul Silver is in Ecruteak City.
move to the 8th gym
He is on Cinnabarr Island.