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Walking with a Pokéwalker holding a Pokémon increases both its experience and closeness, as well as the player’s “watts,” an in-game currency that can be used to catch wild Pokémon and shop for items. The games are bundled with a peripheral called the Pokéwalker, a pedometer that resembles a Poké Ball which can connect to the Nintendo DS game card via infrared signals (in a fashion similar to another Nintendo DS game Personal Trainer: Walking) and can “hold” a Pokémon. The game utilizes the Nintendo DS touchscreen and allows Pokémon to compete in events such as hurdling. A new minigame called the Pokéathlon (called Pokéthlon in Japan) has also been introduced. The player may talk to the Pokémon, and occasionally it may pick up certain items. HeartGold and SoulSilver allows a Pokémon that the player owns to follow him or her in-game on the overworld.
