It is found in the Safari Zone after getting the National Dex. You'll need to put 21 Rocky objects in the area Wasteland and wait 30 days.
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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.
Bayleef Does Not Learn Sleep Powder in HeartGold/SoulSilver
You can't. You need to get Heatran from Pokemon Diamond, Pearl and Platinum and then trade to heartgold and soulsilver.
Sorry but you can't get jigglypuff in Pokemon pearl. You should trade with someone who has soulsilver or heartgold or you can buy soulsilver or heartgold.