Pokémon Ruby and Sapphire/Route 109

Trainers
When you get to Route 109, hop onto the closest island for a fight.


 * Fisherman Carter

An island to the east contains a PP Up. Once you have it, Surf to the west.


 * Young Couple Mel & Paul

When they go down, take two swimmers, then a small girl on the island to the east.


 * Swimmer Alice
 * Swimmer David
 * Tuber Carmen
 * Tuber Gwen
 * Swimmer David
 * Tuber Carmen
 * Tuber Gwen
 * Tuber Carmen
 * Tuber Gwen
 * Tuber Gwen

When you've defeated everyone, step on the beach of Slateport City.