Things You'll Need
Instructions
Insert your Pokémon HeartGold game or Pokémon SoulSilver game into your Nintendo DS and turn on the console.
Choose the "Mystery Gift" option on the main menu of your Pokémon game and then choose "Receive Gift."
Scroll to the option that reads "Get Via Nintendo WFC" and then choose "Yes." Wait a moment for the "Yellow Forest Route" map to download to your Nintendo DS.
Obtain the "Yellow Forest Route" map by going to any Pokémart in the video-game, confronting the green deliveryman standing by the Pokémart counter, and accepting the map.
Save your game.
Choose the option "Connect to Pokéwalker" on your Nintendo DS's main menu and then choose one of your Pokémon from the Pokémon Center box to fully connect the Pokéwalker to your DS.
Choose the "Yellow Forest Route" map on the main menu.
Insert your Pokéwalker device into the fitted slot at the rear of your Nintendo DS to access the "Yellow Forest Route" and to receive access to a land with numerous Pikachu. The Pikachu will have special moves and can be seen flying and surfing.