I have Soul Silver and Diamond, and 2 Ds's but no GBA games.. Can I migrate pokemon from Diamond to SS?

I havent gotten very far on SS, but nearly beat Diamond. Is there a way I can migrate pokemon from Diamond onto SS without a GBA game? I have 2 Ds's. Also would i simlply trade between the 2 DS's? Im new and dont understand the codes for one another and having friends so you can trade back and forth? Help me understand please?