Yup. DW takes a while to start up, what with needing necessary points for the better pokemon and areas, but it's worth it.
And yup, the dragons are all ready. And yeah, using them until after CLay would probably be for the best. They're going to be the star of the show for Iris most likely. And on your soulsilver, if you transfer Latios and Latias if you get them, and clone them, I'll probably be anxiously awaiting copies, haha.