the gym leader volkner uses electric Pokemon
in sunyshore city
you must talk to him in the lighthouse, in sunyshore then you can go in
The Johto Gym Leader Jasmine from Olivine City is in Sunyshore City.
The Sunyshore City Gym Leader can be found in the city's Lighthouse.
you go to Sunyshore City and defeat the las gym leader
you need to cacth dialga first
use ground type
the 8th gym leader in sunyshore city. to unlock it cath palkia or dialga.
beat all gyms or cheat with ar ds
you go to sunyshore city and beat the gym leader
tecnically in sunyshore or other city, but then you need to beat the elite 4 in the pokemon league, past that city.
from that gym leader on the beach of sunyshore city (must have beaten the 8th gym)