how do i get to sunyshore city

I think you need to get to the stone piler that is in mount cornet but to get to the stone piller you have to have 7 badges. To get there you enter mount cornet and take the north path. You will know you are going the right way when you see the looker and another cave entence with debree around it. Hope this helps you.

I have to add to enter mount cornet west of herthome city

You have to beat the seventh Gym and go through Spear Pillar+Distortion World, then when you go there that big tub of lard will be gone and you can go past!

You have to catch Giratina in the Disortion World first. ;)

You cannot catch Geratina in Distorion world, (i think) in Diamond you must find him somewhere else... En i Dont understant Distoriton World xD

i am stuck i cant find the stone pillers

It's just confusing I mean... You go north path to Mount blah blah but I can't see how you go up there? Do you go through the cage cause it's confusing.

I've caught giritina, but still that dude is telling me I can't get there, I have 'rock climb' too so why can't I get past!:-(

If you go onto youtube, there is normally a walkthrough on how to get through mt. Coronet and then into the distortion world.
Hope this helped!:-)

I liked up the key but it won,t let in the galactic building

First you have to have beaten the Team Galactic building. Then you go to Hearthome(have a pkmn with strngth and surf and rock climb, maybe rock smash) and go to mt. Coronet directly left of the town. Now, in the top right corner of the map, there is a previously inaccessible place you need surf and rock climb to get past. To get up to that ledge, go next to the left entrance/exit and surf past that patch of water. Now keep going, own the asses off jupiter and mars, own cyrus too, catch/kill giratina, come back, and you're good to go.

To finish the galactic warehouse ... Have you talked to the galactic in front of the building? He's the weird police guy/creeper. Haven't done it in a while, forgot exactly what to do ..but look it up

Complete the above and that giant ass will stop blocking your way