Go to the Valor Lakefront, and the ur rival will b there. Then the evil person goes to Veilstone city, and you follow them. Then go to ther headquarters and find the key because you talk to the grunt next to the satilite and he drops it. Thn go go inside the building and defeat people.
After you beat the 7th gym in D/P/PT, go to Pastoria City and go near the Safari Zone entrance. There will be a Galactic Grunt, talk to him and he'll run away. Keep following him until he battles you. After you defeat him go to Veilstone City and go to Galactic headquarters. There will be another Galactic Grunt, fight him and he will drop a key when he walks away. In the same city go to the Galactic Warehouse. After going through the Storage you will find a Galactic Key. Go back to the Galactic headquarters and continue. You will have to fight Galactic's boss. When you beat him go right and enter the warp. Continue and fight Commander Saturn. After you beat him press the button. Get out of the headquarters and go to the 3 lakes to see Azelf, Uxie, and Mesprite. After you do that go to Mt. Coronet and continue. You will end up in Spear Piller. You will have to fight 2 Grunts, Cammanders Jupiter and Mars, and the boss. Capture Dialga or whatever and then you can go to the 8th gym. Hope this helped!
you must go into the library in canalave city where youll find DDr rowan then he will tell you to go to lake Valor then ull go into a cave in lake valor beat the commander and then go on ur way to sunyshore city
You don't goto Lake Valor, thats after you catch Diagla or Palkia, Anyway, You must goto Mt . Coronet, there keep goign until you reach the Pillars. If you have Diamond, then you can catch Diagla, But Pearl means Palkia, but before going to catch it, you mus defeat Galactic Team and the boss again. Once you done that, catch the legendary. Then goto SunyShore city and the guy that tells you not to go is now gone :)
The 8th gym. FAIL
^^Failed answer
You go to Goldenrod City(if you beat Olivine city gym also) and go to the radio tower team rocket will have taken over, talk to the guy at the stairs(a team rocket member),Then go down into the tunnel and go tho the place where(i think your childhood friend gave you the fashion case close to it) you take pictures and dress up your Pokemon. :)
Go to the radio tower in goldenrod city and beat team rocket from it or complete the lighthouse Pokemon mission. you can check which one you have to do by listening to the radio for team rocket announcements.
You go to Snowpoint City for the 7th gym.
go to mt. cornet
Beat the gym
The fifth gym leader in Pokemon platinum is crasher wake but you get the fourth badge.
ice
pastoria city
Go in to every Pokemon gym and get beaten at least 10 times againgst the gym leaders.
Candice
You go on to defeat the eight gym leader.
In Diamond, Pearl and Platinum 7th gym is in Snowpoint Town.
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 is at sekka city
you go to deep down in mont coronet i think after you beat the seventh gym
Beat the gym
where can i find the second gym in Pokemon platinum
In the mahogany gym
The fifth gym leader in Pokemon platinum is crasher wake but you get the fourth badge.
You can use the GTS in Pokemon Platinum after you get the first gym badge from the Oreburgh City gym.
The Gym Leader of the Snowpoint Gym.