You get to Sunyshore City by getting to the Spear Pillar in Mt. Coronet. Defeat the Team Galactic members, then talk to Dialga. Catch it, or defeat it for experience fly dialga points. I suggest catching it, you can't get it after you defeat it unless you trade. If you want, after catching it, go to the back of the place where Dialga stood. There will be a poke ball. Inside it is an item for Dialga. Get out of Mt. Coronet, and head toward Sunyshore. Be sure to go the correct way, though at first. get/ kill dialga. fly 2 pastoria. go 2 route 213 the go 2 route 222 find ur way past the trainers and ur in sunyshore city.
Chat with our AI personalities
It is sunny in Sunyshore City.
In Diamond, you can obtain a Water Stone in the underground in Sunyshore City.
Jasmine on the beach in Sunyshore City.
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.