"Pokémon HeartGold and SoulSilver are sold with an included Pokéwalker, which is a pedometer that can provide neat extras in the Pokémon games. Pokéfans can put Pokémon in the device and also use it to find items along certain "routes." According to Bulbapedia, unlocking every route in the Pokéwalker can only be done by walking a minimum of 1,000 miles."