At first go to the top of m.t.coronet,beat team galactic and cath dialga/palkia.Then your path is clear to go to sunyshore.
spear pillar on diamond, pearl, and platinum.
go to top of mt. coronet capture dialga go to sunyshore city and you can get in
To get to Sunyshore city, you will have to found Dialga first. Otherwise, there will still be a blackout and a man will stop you from entering.
U GOTTA HAVE 7 GYM BAGES AND FACE PALKIA OR DIALGA IN SPEAR PILLAR
It's in sunyshore city. There's binoculars and you can see the Pokemon league through it.
It is sunny in Sunyshore City.
In sunyshore city
you have to get dialga after you could go to sunnyshore city.
Go up to the Lighthouse in Sunyshore City. You should see him there. Talk to him and then return to the Gym.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.
Sunyshore City
It is in Sunyshore City.(West of the hotel place)
Jasmine on the beach in Sunyshore City.
spear pillar on diamond, pearl, and platinum.
Sunyshore city, where the last gym badge will be.
after you beat Cyrusin the distortion world
To unlock Sunyshore City in Pokémon Pearl and Diamond you have to beat Team Galactic. They can be found at Mt. Coronet.