
Attention, all players of Pokémon HeartGold and SoulSilver! If you're bored of walking the same old routes on your PokéWalker, a brand new one is now available for download. The Yellow Forest (which sounds racist, but isn't) can be downloaded to your DS via Nintendo WFC. So, find a hotspot and get your forest on!
The Yellow Forest is available via the "Mystery Gift" section on the main menu. Simply enter that section, and choose to receive a gift via Nintendo WFC. After a few moments of searching, you should be able to download it to your cartridge. You can then go to any Pokémart in the game and unlock the prize.
The Yellow Route can be walked through via the PokéWalker. It's full of Pikachu, including some unique ones with special moves. It's totally free and worth checking out, so why not do that?

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