How do you move phyducks in diamond Pokemon?

There is no Pokémon named "Phyducks" in the Diamond version of the game, nor in any other Pokémon game. It's possible you're thinking of a different Pokémon or misspelling the name.

Could you clarify the name of the Pokémon you're asking about?

Perhaps you're thinking of:

* Psyduck: A Water-type Pokémon known for its constant headaches.

* Ducklett: A Water-type Pokémon that evolves into Swanna.

Let me know if you have any other questions!