You can trade between HeartGold and Platinum as soon as you have gotten the regional PokéDex in both games so HeartGold can trade with Platinum as soon as Professor Oak gives you the PokéDex in Mr. Pokémon's place and Platinum can trade with HeartGold as soon as Professor Rowan gives you the PokéDex.
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you can trade Pokemon from heartgold and soulsilver to your diamond,pearl, or platinum.
yes. you can trade Pokemon from diamond, pearl, or platinum to heartgold or soulsilver.
yes the same way you would trade form pearl to platinum
trade rotom from platinum
No, you have to trade with diamond, platinum or pearl.