How do I get to Sunyshore City?

You first need to complete the team galaxy events then go to the distition world complete the puzzles, battle or capture giratina, then go all the way to sandgem twon talk to prof. Rowan then you can enter sunyshore city. Hope this helps.

You need to finish all the plot events before you can move on to Sunyshore. Once you battle Giratina, you should be able to move past him.

You have to go the other way, towards Hearthome and complete the Team Galaxy events. Sunyshore is the last place you go to before Victory Road and the Elite 4.

How 2 Get 2 Sunyshore City:
1. When you've got your 7th gym badge from Snowpoint city, head through Mt Coronet.
2. In Mt Coronet, there would have been a cave painting that was blocking the way to the spear pillar. However you will now find it smashed by Team Galactic, allowing you to pass.
3. Head through the passage which leads to the spear pillar, battling Galactic Grunts along the way.
4. When you get to the spear pillar, Cyrus will be there. You will then have to battle Mars and Jupiter and after you defeat them, a portal will open and allow access to the Distortion World.
5. Travel through the Distortion World with Cynthia until you reach Giratina. Battle it and catch it. Don't worry if you kill it, you can try to catch it again later on.
6. After you've caught Giratina or killed it, you will then appear in front of Prof. Rowan. He will then tell you to go to Sunyshore City.
7. Go to the Route with the Hotel on it and when you reach the route which goes to Sunyshore City, it will be clear.
8. Head down that route until you reach Sunyshore. Done
Hope this helped :-)