Inside of this camper is a Maid who will buy food items like Big Mushrooms from you for a higher price than what a Poke Mart will give. If you walk between the south fence and the trees you will eventually find a Hyper Potion. Northeast of the camper is a Backpacker standing in front of a Great Ball.
There is a Revive next to him. You can also find a Zinc through the thick grass. A Zinc raises the Special Defense stat of a Pokemon. Hop down the ledge and there are four trainers left to fight on the road.