Route 205 is a winding path with several trainers and wild Pokémon like Buizel and Shellos. Collect items and battle trainers. You'll soon reach Eterna Forest. Upon entering, a mysterious girl named Cheryl will join you. She'll heal your Pokémon after every battle, making this a great place to train!
Work your way through Eterna Forest, battling trainers and catching Pokémon like Buneary and Wurmple. Cheryl will leave you at the exit. Continue west on Route 205 (the western section) until you reach Eterna City.