Yes. (B in this case) It probably has something to do with the roamers because I have no problems hitting wild/stationary Pokemon seeds. This is ridiculous. I tried without advancing the frame and get some other result that doesn't show up.
EDIT: JRT: There's an option for that but I heard it's still being figured out.
Are you pressing A on the DS menu one second before your target second? Because the game takes one second to get seeded so you have to start one second before.
Also, are you holding B until you see the shooting stars?