Pokewalker

A Pokewalker is a small pedometer that comes free with purchase of HeartGold and SoulSilver and is so far only able to be used in those games

Details
The Pokewalker is available for use once you are able to put a Pokemon into the PC. Once you do so you would have to restart the game and choose connect to pokewalker at the main menu (Below the New Game choice) once there you choose 1 pokemon from your PC, choose a path, and then transfer it into the walker. Once your walker is set up, you must actually walk (or at least shake it a few times) to be able to access the minigames in the main menu. one game is a game of chance which allows you to get items such as potions and revives, while the other is 2 split minigames used for catching pokemon, some of which are exclusive to pokewalker or trades (such as Skitty).