From the entrance to the Moor of Icirrus, walk southwest around the trees to find a new path east. Take the new path and talk to the Parasol Lady. She gives you TM 42 Facade. The power of Facade doubles if the Pokemon using it is poisoned, paralyzed, or burned. Continue northeast to battle the Fisherman near the lake.
To the east, behind the sign, is another Parasol Lady that gives you a certain rock once per day. The rock she gives you depends on when you talk to her during the day: a Damp Rock during the morning, a Heat Rock during the day, a Smooth Rock during the evening, and an Icy Rock during the night. Each rock increases the duration of its related weather effect in battle for 5 to 8 turns when used by the Pokemon holding it. As you try to enter the Tubeline Bridge to the east, Bianca appears for a battle.