I was looking for the same thing (but from Platinum) and I found this:
Trading pokemon from Pearl to HeartGold:
Method 1:: If you own two DSes, directly trade from the wireless room on the upper floor of a PokeCenter.
Method 2: Use the GTS to put up the Pokemon you want to trade, and quickly switch over to the other and trade for it. The least reliable of all methods, for your Pokemon could be traded to someone else or it might not even show up in the other game's GTS list.
Method 3: Ask someone else to trade with you, give that person all of the Pokemon, and then get them to trade them to your other DS. This is one of the most popular methods.
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