Things You'll Need
Instructions
Open your current saved game in "Pokémon Soul Silver" and press the Start button to pause the game.
Select Connect to Pokéwalker.
Hit Go for a Stroll and choose a Pokémon to join you. Any of your current Pokémon will do.
Press the center button on the Pokéwalker to turn it on. Press it again to select Connect and keep the Pokéwalker near your Nintendo DS.
Choose a route on the Nintendo DS. You have a higher chance of finding a Feebas on the Quiet Cave route but may not be able to access it until you have walked some of the other routes.
Confirm the route and press Connect on the Pokéwalker. After they sync, you will see your Pokémon on the walker.
Select Pokéradar on the Pokéwalker to find and fight random Pokémon. Once you encounter and catch a Feebas, you can transfer it back to the Nintendo DS using the Connect feature.