Get the National Dex and go to Goldenrod and get the Hoenn music channel on and go to the grass just in front of Goldenrod
In heartgold on Wednesday you can go to the radio on your pokegear. Next you want to go to the music channel and the DJ will say it is Wednesday and that means it is time for some Hoenn music. Listen to it and then shut your pokewalker off and the music should still be playing in the game. Now you want to walk around in route 30 while the "Hoenn Sound" is playing. After a few tries you should find a whismur. This should work if you do this correctly. If the music stops when you fly to route 30 restart it in route 30.
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The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
The Quick claw is located in the National Park in Pokemon Heartgold and Soulsilver.
You can't. You need to get Heatran from Pokemon Diamond, Pearl and Platinum and then trade to heartgold and soulsilver.
You can't find a Whismer walking around.
In HeartGold and SoulSilver, she does not battle you - which might be one of the reasons why she doesn't have a starter pokemon. Instead, she has a Marill.