HELP! plzzz

After you get the 7th gym leader badge, you can head for the Galactic headquarters in veilstone city and defeat the boss cyrus and head for Mt. Coronet where you team up later with your rival and battle commanders jupiter and mars... Once you do that you battle cyrus again by yourself and after defeating him they run away and the prof. And his assistant will arrive and tell you to capture the awakened Pokemon of time or space(depending on your game pak)

After you beat the Seventh Gym leader, here is what you need to do. Go to the Lake near Snowpoint City, because now you will be able to get through it, so go in there and defeat everyone. When you do that, fly to Veilstone City, and wipe the floor with everyone in the Galactic Headquarters. You should now be on your way to Mount. Coronet after you defeat everyone. Proceed through the cave, taking down everyone that stands in your way until you reach the top of the Mountain. Team up with your rival, and beat all the bosses there, then catch Dialga, and leave the Mountain. Go East of Pastoria City, and go east of the restaurant Establishment, and soon you will be on the path towards sunyshore City.

This is very simple go to mountain where you catch dialga fight all of the people up there you will need surf rock climb rock smash waterfall and strength when you beat or catch dialga go to the place right next to valor lakefront there will be a person that lastime said you could not pass now you can the rest should be easy

First you go to the lake near snowpoint city and then you wipe out everybody there after that fly to veilstone city, go and talk to the galactic guy outside the big building and then goinside the small enterance of the headquaters after that you kill the boss there and go up mount coronet and fight the commanders mars and jupiter before you can figght the boss and even after that you have yo fight dialga and then you can go to sunnyshore city to challenge the 8th gym

After you beat the Seventh Gym leader, here is what you need to do. Go to the Lake near Snowpoint City, because now you will be able to get through it, so go in there and defeat everyone. When you do that, fly to Veilstone City, and wipe the floor with everyone in the Galactic Headquarters. You should now be on your way to Mount. Coronet after you defeat everyone. Proceed through the cave, taking down everyone that stands in your way until you reach the top of the Mountain. Team up with your rival, and beat all the bosses there, then catch Dialga, and leave the Mountain. Go East of Pastoria City, and go east of the restaurant Establishment, and soon you will be on the path towards sunyshore City.

Go get Dialga at Mt. Coronet. Then you will have access to Sunnyshore.