Yes Diamond, Pearl and Platinum will be able to trade with HeartGold and SoulSilver, all HeartGold and SoulSilver needs is the PokéDex and you need to have at least 2 Pokémon with you and you need to be at a Pokémon Center.
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platinum, soul silver, heart gold, diamond and pearl
Diamond, Pearl, Platinum, Heart Gold, and Soul Silver.
You can use a Cyndaquil as a starter Pokemon in heart gold, soul silver, gold, silver, crystal and diamond pearl platinum.
To get both leafeon and glaceon in Pokemon soul silver or heart gold you have to trade it from diamond pearl or platinum.
yes you can but you cant trade from pearl , diamond , platinum , soul silver , heart gold to Pokemon black & white