Things You'll Need
Instructions
Go north from Route 34 to reach Goldenrod City. Continue to walk north through Goldenrod City until you exit to Route 35.
Turn right on Route 36 when you get to the National Park. Soon after you make this turn, you reach a junction blocked by a Sudowoodo.
Spray the Sudowoodo with water from the squirt bottle to wake it up and fight it. Catch the Sudowoodo with a Poké Ball, if desired, since this is the only place to find this Pokémon in Johto.
Walk to the east until you pass the Ruins of Alph to the south. A man walks around in circles near the entrance to Violet City. Talk to him to get Rock Smash.