After you beat Sabrina, the 6th gym leader in Saffron City, you can use Rock Smash.
The Thunder Badge
The fourth gym at Pokemon fire red is grass type gym
You cannot rebattle Gym Leaders.
You beat Roxanne the first gym leader in Rustbordo City
after you beat the fire gym then walk out and your rival will give it to you.
You get the card key which lets you open the gym which is locked.
The Thunder Badge
You get the card key which lets you open the gym which is locked.
Beat the first gym leader: Roark.
no
In his Gym in Cinnabar.
it is in saffron
rocksmash isn't a HM, it's a TM. but i think you get it from a gym leader.
beat the gym leader
the thunder gym in in vermillion city
In the cinnibar island gym.
You have to beat the 2nd gym.