Mossdeep Island; surf east along route 124 from Lilycove. To do this you'll have to have cleared out the Team Aqua base, as there is an aqua grunt trying to move a pack (flock?) of Wailord in your way.
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You will find the key to the Gym of Cinnabar Island, From the Pokemon Mansion that is on the same island.
In the 8th gym. he is the gym leader
Wattson the electric gym.
journey again to achieve the another battle called the 8th gym Pokemon ruby
The Fourth Gym is in Lavaridge City.