Pokémon Ruby and Sapphire/Walkthrough/Petalburg Area

Route 102
Along this route, you will want to catch Ralts (Which is hard to find), {{{2} and Surskit (which is very rare).

In the first patch of grass, there are no trainers. Before the second, you will face:

Continue along the path, and face:

To the south of that last trainer, you will find a Potion.

Continue to the west from the trainer, and you will enter Petalburg City.

Petalburg City
Go to the gym, and talk to the person there. This person is your father. While you talk to him, someone else comes in and asks for a Pokémon. This person is Wally, the kid from next door. Your father lends him a Zigzagoon, and sends you with Wally. Wally catches a Ralts, and then returns with you to the gym.

Route 104 and Petalburg Woods
Head to the west. As soon as you can, turn south and go down the stairs. You are now on the beach. If you want, you can face the trainer who is walking:

In the grass area you've just went around, you can catch Taillow and Wingull.

Continue towards the forest. The forest is home to Shroomish and Slakoth. In addition, there are trainers in the forest. The first one is:

Once in the woods, turn to the east. At the end of the path, there is a grassy area with a missing square. Step up to that square (not onto it), and get the item in there by pressing the A button. This is known a a hidden item. Head to the south, and get the item there (a Poké-ball).

Go back to the main entrance of the woods. Head to the west, and face:

Don't forget to pick up the PARLYZ HEAL.

Continue along the path, and then you face:

Next trainer along the path:

North of him, you can find an Ether.