Once you cross the bridge, go behind the yellow house with the red roof and collect the Berries from the eastern ledge. Then leap down and enter the house. This is Lanette's home. Talk to her to receive a Lotad Doll (Sapphire/Emerald) or Seedot Doll (Ruby). The next time you visit a Pokémon Center, her PC will be called Lanette's PC. near Lanette's house is a man who will give you a Berry. Return here to get a new Berry each day. Collect all five. Head south down the path.