I believe you have to talk to him at the top of the lighthouse first.
Volkner, the gym leader of Sunyshore (yes, that's how it's spelled) has an Octillery.
His name is Volkner and he is the gym leader of Sunyshore. To get to Sunyshore travel to the right of Pastoria and lake Valor.
gym leader volkner in sunyshore city
In sunyshore city
the gym leader volkner uses electric Pokemon
The Sunyshore City Gym Leader can be found in the city's Lighthouse.
in sunyshore city
sunyshore city
you must talk to him in the lighthouse, in sunyshore then you can go in
In Pokemon Diamond, you get Dialga before the 8th gym battle. After you beat the 7th gym, you battle at the peak of Mt. Cornet, Spear Tower, and battle, preferably catch Dialga, then you can access Sunyshore City. In pearl you battle Palkia.
You will need to defeat Volkner, the Sunyshore City Gym Leader.
You try to go to sunyshore city