Beyond the Sea Obtaining a foreign Pokémon through the GTS
Night Sky's Edge Transferring any Jirachi to Pokémon HeartGold and SoulSilver
Yellow Forest Event download to Pokémon HeartGold and SoulSilver
Rally Event download to Pokémon HeartGold and SoulSilver
Sightseeing Event download to Pokémon HeartGold and SoulSilver
Winner's Path Event download to Pokémon HeartGold and SoulSilver
Amity Meadow Event download to Pokémon HeartGold and SoulSilver
Source- http://bulbapedia.bulbagarden.net/wiki/PokéWalker
Hope this helps =P