Pokémon Emerald walkthrough/Petalburg Woods

Petalburg Woods
Petalburg Woods isn't hard to navigate through, compared to other forests in the Pokémon games. Go eastward (there is a Potion hidden in the tall grass) and get out through the second exit. Pick up the Poké Ball and come back to the forest. Now head westward and take the Parlyz Heal. Eventually, you will see a man getting attacked by someone who is up to no good. You will have to rescue the man by defeating the guy attacking him. Once defeated, the Team Aqua grunt will run away, and the man will thank you gratefully and reward you with a Great Ball. Afterwards, you can use the north exit to reach the north side of Route 104.

There are two trainers here: