well heartgold and soulsilver takes place in the kanto and johto regions, so obviously the pokemon from those regions are there, though probably not in the same place as the original games. there is also hoenn region and sinnoh region pokemon in this game, but in order to get those you have to listen to a certain type of musice on the radio on a certain day in the game. for more help on where to find hoenn and sinnoh region pokemon in these games, you should really go to seribii.net
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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.