beat the pastoria gym leader then follow the galactic grunt near the great marsh then battle him at the valor lakefront then when u beat him cyintheia comes out of nowhere and gives u the a secret potion then go to the psyduck then press a and u use the potion and the run off
you give them the potion that cynthia gives you.
The Psyduck are at the northern part of Route 210, standing in the way of the path. These are the Psyduck you will need to use the Secret Potion on.
psyduck and golduck are ducks and if I'm not mistaken ducks are birds :)
Psyduck learns 9 moves. water sport scratch tail whip at lv. 5 disable at lv.10 confusion 16 screech 23 psych up 31 fury swipes 40 swagger 61
There is no guy that I know of that can teach headbutt in pokémon diamond.
In Diamond and Pearl Psyduck learn Disable at level 14.
You have to keep following the road to the right of the psyduck until u get to the next lake. Cythia will then give it to you :)
First you have to find Gilatic Grunt then you have to keep chasing him. Once you chased him then battled him, on the right is Cynthia then she should give you a potion to move the psyduck blocking your way.
in almost every body of water (using surf)
Read this http://wiki.answers.com/Q/Where_is_the_5th_gym_leader_in_Pokemon_Diamond
you can usally run into psyduck in lakes. there is the great marsh though.....
you have to give them a secret potion that you get from Cynthia
Water pump ain't a move
After the explosion at the Great Marsh, follow the Cyrus and beat him. Then Cynthia will give you the SecretPotion, which makes the Psyduck's heads feel better and makes them move.
When you go to the lake by Pastoria city and you get its gym badge the champion will come to you when you go by it and give you a SpecialMedicine that you give to the Psyduck
you give them the potion that cynthia gives you.
Head north to Celestic Town. If you are stuck because of the Psyduck on Route 209, then you need to go to Lake Valor after meeting your rival, Lucas and Proffessor Rowan in Canalave Library. At Lake Valor, you will see Cynthia, who will give you a SecretPotion to move the Psyduck, and an Old Charm to deliver to her grandmother in Celstic Town. Hope this helped. :-)