First you to go to Mt.Coronet and catch or kill or make Palkia escape and then go to Valor Lakefront to the Lady who lost the Suite key find the Suite key near the Valor Lakefront and the road to Sunnyshore City is open
Sunyshore City is on the east side of Route 222. To get pass the guy blocking the way you'll need the 7th Gym Badge from Candice, obtain the HM Rock Climb, then fight Mars and Saturn. After you have defeated them, go to Lake Acuity to find out the last legendary trio is with Team Galactic and you'll need to make your way to Team Galactic HQ in Veilstone City. Freeing the Legendary Trio, enter through Mt. Coronet. You'll need to reach the top of Mt. Coronet where you have to face Cyrus, before going into the Distortion World. Defeating him, Giratina is the last problem now. You'll hop into the Distortion World and make your way through the maze till you face it; you can defeat it here or capture it. After this is all done, the guy will move out of the way from Sunyshore City, giving you welcoming access to the last city of the 8th Gym.
first you have to beat Candice of snowpoint then go to lake acuity then go to veilstone and a galactic dude dropped a key that you get go to the warehouse then go to the main building and free uxie mespirit and azelf then go to the top of mt corrent (start in oreburg) and fight palkia after that you can go to sunshine shore (fwi: its really called sunnyshore city) hope i helped!:-)
go to the spear pillar and fight, catch Palkia, and go to Veilstone/Pastoria and go to sunyshore city
you first have to get giratina and go to lake valor and the man will let you pass and you just keep going straight.
you have to go to spear pilllar after fighting cyrus in vielstone city then the blackout is fixed
You have to got 7 Gyms Badges.
pancakes
it is in veilstone city
hearthome city
It is in Sunyshore City.
Go to Veilstone city.
Petalburg City is not in Pokemon Platinum.
You can find a Shell Bell at Hearthome City in Pokemon Platinum.
Hearthome city.
below hearthome city
In Pokemon Platinum, Diamond, and Pearl, the department store is is Veilstone city.
Eterna City
Jubilife city
hearthome city
pancakes
it is in veilstone city
In Shunishoart City.
you surf