After beating the seventh gym, go ro lake Acurity (by snowpoint city) and witness a scene about your rival losing to team galactic. Then, fly to the Galactic HQ (in veilstone city) and talk to a grunt in front of the building. He will drop a warehouse key. Go through the warehouse until you find the HQ key. Then, go back to the HQ and go through the maze of stairs, walls and grunts. Eventually, you'll end up in a room with Cyrus in it. Battle him, and he'll give you a master ball. Then you'll have to go to another room and battle a commander so you can free Uxie, Azelf and Mesprit.
After doing all that, you need to find your way through Mt. Coronet (entrance is between Oreburg and Hearthome). You will eventually make it to Spear pillar, where you will witness a scene of Dialga creating a new world. Then, you will have to double battle two commanders with your rival. After beating them, your rival will heal your Pokemon so you can fight Cyrus again, and mesprit, uxie and azelf will save dialga. If you beat Cyrus, he will disappear for the rest of the game. Professor Rowan and his assistant (Dawn or Lucas) will say what a great battle it was ect. Rowan will then tell you to battle dialga. Anyway, after catching(or fainting) dialga, you can travel to Sunyshore city to beat the electric type gym. Hope that helps.
~Jsh29
the seventh gym badge snowpoint gym
The first gym in Pokemon diamond is in Oreburgh City
you go to the lake to battle team galatic and then you go to snowpoint city to get your seventh badge.
pryce the ice type gym leader
fire
The seventh gym in Pokemon Diamond, Pearl, and Platinum is located in Snowpoint City, which is to the East of Lake Acuity.
the seventh gym badge snowpoint gym
She uses Snover, Sneasel, Medicham, and Abomasnow.
that's easy... abomasnow, weavile, snover and sneasel
In Diamond, Pearl and Platinum 7th gym is in Snowpoint Town.
the best way to beat the 7th gym leader is with a fire type Pokemon
The seventh gym leader in Pokemon Diamond is located in Snowpoint City. Her specialty is Ice type Pokemon, so make sure and have a powerful Fire type. Good luck!
Snover lv38, Sneasel lv38, Medicham lv40, Abomasnow lv 42.
the seventh gym is at sekka city
acultly lakefront
snowpiont city snowpiont city snowpiont city snowpiont city
You get the seventh gym badge after you defeat the snowpoint gym leader Candice she carrys the following Pokemon .... Snover, Sneasel, Medicham and Abomasnow and if your wondering how i know so much i am the Pokemon champion so you can send me questions anytime My name on wikianswers is ILovePokemon GOOD LUCK ON YOUR GYM BATTLE!!!!!!