The Pokéwalker is a pedometer accessory for the Nintendo DS game Pokémon HeartGold and Pokémon SoulSilver. It allows players to transfer their Pokémon from the game to the device, enabling them to earn experience points and items while walking. The device tracks steps and features mini-games that enhance the gameplay experience. Released in 2009, the Pokéwalker connects wirelessly to the Nintendo DS and can hold one Pokémon at a time. Players can also encounter wild Pokémon while walking, adding an interactive element to physical activity. The device promotes exercise while engaging players in the Pokémon universe.