Most Trainers zoom down the Cycling Road so fast that they never notice the cave underneath. Take a few minutes to pick up some items and wild Pokémon.
Wild Pokémon can only be encountered on this route if you can use Cut. Cut away the small tree to the left of the southern exit building to enter the area of the route where wild Pokémon are found. Several other Pokémon can be found on the honey tree under the bridge.
Several items can be found on this route. Here is a list of all of the items and their locations.