Well, it's been about a day since my last post, so I don't think this counts as double-posting, but...
I'm currently doing a play-through in my Diamond version. I've cleared Valley Windworks of Team Galactic a couple days ago. (I've made it to Solaceon Town) If I change the DS clock to Friday, (and a slight change in time due to switching to my DS to change the clock) will I be locked out of being able to catch the Drifloon that appears on that day? I want to use the little ghostly balloon in my play-through, but don't necessarily want to wait until Friday actually rolls around.