in heart gold you see Ho-oh first
soul silver lugia first
heart gold has a different starting screen with ho-oh in it
soul silver has lugia in the starting screen
heart gold lets you catch Kygore and latias
soul silver lets you catch groudon and latios
heart gold lets you catch growlith, caterpie and spinarak
soul silver has vulpix, weedle and ledyba.
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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.
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.
The only way to get a gligar in pokemon soulsilver is to trade with pokemon heartgold.