In first gum in petarburg city you can not go. Your first gum is in rustoboro city. But you can battle in petarburg city gum if you have 4 gum badges.
Pokemon ruby where is the 6 gym
you have to complet the gym first and the traps will be gone
petalburg gym
its the petalburg gym and/or gym 5.
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.
In Pokemon ruby, the first electric gym is wattson's gym, it is the third badge you obtain in the game. A good strategy to beat him is to bring along a ground type, or a fire type since he uses a Pokemon called magneton, which is Electric/Steel.
The town in which the third gym is in on Pokemon ruby is in Mauville City (or town, I don't know which one)
In Pokemon Sapphire, Ruby and Emerald the 7th Gym that's located in Mossdeep City has Psychic type Pokemon.
it is Mauville gym
The Fourth Gym is in Lavaridge City.