it is in lavaridge town
Pokemon ruby where is the 6 gym
i haven't played that version but if you go to youtube search up pokemon ruby walkthrough
petalburg gym
its the petalburg gym and/or gym 5.
You have to get 4 gym badges. Then head back, and battle him.
journey again to achieve the another battle called the 8th gym Pokemon ruby
In the 8th gym. he is the gym leader
Wattson the electric gym.
The town in which the third gym is in on Pokemon ruby is in Mauville City (or town, I don't know which one)
it is Mauville gym
The Fourth Gym is in Lavaridge City.
In Pokemon Sapphire, Ruby and Emerald the 7th Gym that's located in Mossdeep City has Psychic type Pokemon.