Defeat Norman, the Petalburg Gym Leader
Go to Wally’s house in Petalburg City
Talk to Wally’s father to receive HM03 Surf
Teach Surf to a compatible Pokémon
Use Surf outside battle after obtaining the Balance Badge
Defeat Norman, the Petalburg Gym Leader
Go to Wally’s house in Petalburg City
Talk to Wally’s father to receive HM03 Surf
Teach Surf to a compatible Pokémon
Use Surf outside battle after obtaining the Balance Badge