well, after exiting the gym, head to the main street on the left. a team aqua thief should run by. follow him out of the city until you see a cave. go on from here.
Chat with our AI personalities
You beat Roxanne the first gym leader in Rustbordo City
You cannot. You can only do so in Pokemon HeartGold and SoulSilver.
It at the cutters house in Rustboro city(you have to defeat the gym leader Roxanne in Rustboro city to be able to use it).
beat the 8th gym
In Rustboro right next to the poke center there is a house called cutters house. go in and talk to the guy and he will say you are a talented trainer and he will give you cut. you need the badge from Roxanne to use it.