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The PokéWalker (Japanese: ポケウォーカー PokéWalker) is a pedometer, separate from the Nintendo DS systems, that allows player connect with a compatible Pokémon game to transfer and exchange Pokémon from their DS card to this hardware device. The PokéWalker is just like a real pedometer, that counts each step a person takes by detecting the motion of their hips, while recording each step and adding it to the experience of a deposited Pokémon. It will be bundled with Japanese version with Pokémon HeartGold and SoulSilver when they are purchased, however it is unknown whether it will be bundled with English version of the game.
The PokéWalker has both the shape and colors of a regular Poké Ball. It is about 4.8 centimeters in diameter, 13.9 millimeters thick, and will weigh about 21 gram. It has three buttons and a black and white, monochrome interface. It will allow players of HeartGold and SoulSilver to connect wirelessly with a Nintendo DS system, and deposit up to three Pokémon there. One of the deposited Pokémon can then be set to show on the PokéWalker's screen. This Pokémon will then be able to gain experience and happiness as players walk around with the PokéWalker attached.
This pedometer is the remake of Pokémon Pikachu 2, which is a toy that can be used to obtain Mystery Gifts in Gold, Silver, and Crystal. Similar to that toy, the PokéWalker will use the currency Watt (W); Watts will be obtained at random as steps are taken. By using Watts, PokéWalker players can use the Poké Radar and Itemfinder devices to catch wild Pokémon and find special items, respectively. These can be sent to HeartGold and SoulSilver.
There are several functions available in-game. As the player play on the PokéWalker, they will occasionally come across mini-games, that have an effect on the player's Pokémon HeartGold and SoulSilver games, however it is unknown whether or not these will be mandatory to play.
The PokéWalker's main function is the pedometer attached to it, which allows the deposited Pokémon to gain experience out of the Pokémon HeartGold and SoulSilver game cart. It will act like a real pedometer, counting each step a person takes, and recording each step and adding it to the experience of a deposited Pokémon. Each step the PokéWalker detects, the deposited Pokémon will then gain experience points as players walks around. The deposited Pokémon will also gain happiness as it goes along.
Another feature on the PokéWalker is the Itemfinder. Much like in the main games, the Itemfinder will help the player find items in the wild. Each use of this function costs 3 watts, and the player has two chances to find an item hidden among six grass tufts. If the item is not found the first time, the Itemfinder will tell the player if the item is close by or far away. If the item is close by then it is likely either to the direct right or the direct left of the first checked grass tuft. Likewise if the item is far away then the item is at least two grass tufts away in either direction. If the item is not found on the second search, the player will be out of luck and will have to pay an additional 3 watts to try again.
Found items can be transferred to Pokémon HeartGold and SoulSilver where they can be added to the player's Bag. Players do not need to transfer the items straight away, but can continue to collect items and then transfer several of them at once later. However, the player can only store up to 10 items on the PokéWalker at any one time.
 Areas of PokéWalker
The Pokéwalker has 27 distinct areas that a player can have their Pokémon visit on sending them from HeartGold or SoulSilver. The main difference between them is the species of Pokémon that can be found using the Poké Radar. Also, each area of the PokéWalker has different items to find, including some rare items unique to that area. Some areas are unlocked from the start, while others can be unlocked by various means.
- Refreshing Field - Unlocked at the start
- Noisy Forest - Unlocked at the start
- Rugged Path - Unlocked by earning 50 watts
- Pretty Seaside - Unlocked by earning 200 watts
- Residential Area - Unlocked by earning 500 watts
- Dark Cave - Unlocked by earning 1,000 watts
- Blue Lake - Unlocked by earning 2,000 watts
- Town Edge - Unlocked by earning 3,000 watts
- Hoenn Field - Unlocked by earning 5,000 watts
- Warm Beach - Unlocked by earning 7,500 watts
- Volcano Route - Unlocked by earning 10,000 watts
- Tree House - Unlocked by earning 15,000 watts
- Scary Cave - Unlocked by earning 20,000 watts
- Sinnoh Field - Unlocked by earning 25,000 watts
- Cold Mountainpath - Unlocked by earning 30,000 watts
- Big Forest - Unlocked by earning 40,000 watts
- White Lake - Unlocked by earning 50,000 watts
- Rough Sea - Unlocked by earning 65,000 watts
- Resort Area - Unlocked by earning 80,000 watts
- Quiet Cave - Unlocked by earning 100,000 watts
- Beyond the Sea - Unlocked by obtaining a foreign Pokémon through the GTS
- Edge of the Night's Sky - Unlocked by transferring a fateful encounter Jirachi to Pokémon HeartGold and SoulSilver
- Yellow Forest - Unlocked by downloading via Wi-Fi to Pokémon HeartGold and SoulSilver during an event
- Event - Unlocked by downloading during an event
- Shopping - Unlocked by downloading during an event
- Champ Road - Unlocked by downloading to Pokémon HeartGold and SoulSilver via wireless during an event or through Wi-Fi during an event
- Amity Field - Unlocked through a currently unknown method
 With other Pokéwalkers
If two Pokéwalkers are within range of each other, and infrared communications are activated, the two players' Pokémon will interact, and each player will receive an item. Which items are given is based on the course the player is using at the time. A player can only link with the same person once per day. Similar to mixing records, once two players connect their Pokéwalkers, then their in-game team data at the time they sent their Pokémon to the Pokéwalker will also be passed to the other person. When a player then sends their Pokémon back to the games, then the person that they connected with and their team will appear in the basement of the Trainer House located in Viridian City so that they can be battled for one Battle Point once a day.
 With Pokémon HeartGold and SoulSilver
The PokéWalker is only compatible with Pokémon HeartGold and SoulSilver using a Nintendo DS, Nintendo DS Lite, Nintendo DSi or a Nintendo DSi XL system. The PokéWalker connect to the DS using a wireless connection. To send Pokémon over to the PokéWalker, the player must open a specific menu in HeartGold and SoulSilver. The location of this menu is currently unknown. In this menu, the player can select Pokémon from boxes and send them over to PokéWalker. It appears that there are three slots for the Pokémon in PokéWalker.
In communication with the PokéWalker, the player is able to keep track of certain information and events from it such as how many steps they have taken and how many watts they have built up. When the Pokémon is returned to Pokémon HeartGold or SoulSilver, the goings on of the player's Pokémon will be added to the PokéWalker Diary in HeartGold or SoulSilver. This will tell the player if they have captured any Pokémon while they were in the PokéWalker, communicate with other people, or find items within the PokéWalker.