I have a really weird situation on my hands.
I'm walking on Driftveil Drawbridge for the first time on Black. Everything is fine; I pick up a Clever Wing off the ground. I walking on the bridge, and I'm surprised to hear the flapping sounds, but no feathers falling to the bridge. I really want a Ducklett for my team, so I'm looking all over the place. I've doubled back on the bridge, I've exited and re-entered. I'm not using a Bike or anything...All that's left is resetting (I saved just before the bridge, luckily).
Anyone else have this odd...glitch? If it is a glitch at all?
Don't worry, it's not a glitch.
I had the same thing happen.
The problem was the "shadow" that yields either Feather or Ducklett can also appear on the black areas that follow the very edge of the bridge so it can be extremely hard to see.
Next time this happens, take a look at the bridge edges carefully.
Also be noted that you can hear the sound before you can actually see the shadow, so you may need to move farther on the bridge.