you can get to the 8th gym after you defeat team galactic and defeated 7th gym.
The eighth gym leader in Pokemon platinum is the one in sunny shore city.
in sunnyshore
in sunyshore city
you must beat the eighth gym leader and he will give you the badge.
The eighth gym leader of Sinnoh, Volkner, returns to battle you again in Platinum after you beat the Elite Four. When you get to battle frontier, you and your rival have a double battle against Volkner and Flint, an Elite Four member.
you have to battle all the trainers and repeat it ..................... Im sure you can do it.
You go to SunyShore City, Then go on that glass sorta thing and it's up there somewhere!
The fourth gym in platinum is the veilstone gym
The eighth gym leader is Claire in Blackthorn City
it depends............................WHICH GAME??!!??!!
The Steel-type Gym in Platinum is in Canalave City.
you have to beat or catch giratina then you get out of that place and then you go talk in his lab and then go to valor lakefront and you go to route 222 and then you be at sunnyshore city