How do you get past the Psyduck that areb locking way in Pokemon diamond?

It sounds like you're trying to navigate the Psyduck blocking the way in Pokemon Diamond! You're probably referring to the Psyduck in the Valley Windworks area.

Here's how to get past them:

* Use Strength: The Psyduck are blocking a path that requires you to move some rocks. You need the Strength HM to do this. You'll get this HM from the Cycling Road trainer, who is located near the entrance of the Valley Windworks area.

* Use the rocks: Once you have Strength, you can use it on the boulders that the Psyduck are blocking. This will allow you to clear a path and continue on your journey.

Let me know if you have any other questions or need more help navigating through the game!