Yes they can because platinum was an extension of diamond and is in the same region, Sinnoh.
Chat with our AI personalities
you can not get it from Pokemon platinum you can trade in to diamond or pearl
yes. you can trade Pokemon from diamond, pearl, or platinum to heartgold or soulsilver.
IT isn't in Platinum you have to trade for it from Global trade or Diamond
you can trade Pokemon from heartgold and soulsilver to your diamond,pearl, or platinum.
yes