First off, the leader is called Candice. The gym is splat in the middle of the city. If you want to get past the snowballs, go in, down the stairs, left up the stairs, forward, fight the trainer, go left, go forward, go right, go down, go right, then go to where you fought the trainer again, then go right. Go right again, go down, then left. The last set of snowballs should be obvious.
Pastoria city
You need to defeat the hearthome city gym leader and get to solacean town.
beat the first gym leader in oureburg city he then gives it to you
In Pokémon Platinum, the Gym Leaders are in Oreburgh City, Eterna City, Hearthome City, Veilstone City, Pastoria City, Canalave City, Snowpoint City and Sunyshore City however when you first get to Oreburgh City, the Gym Leader there will be in the Oreburgh Mines and when you get to Hearthome City, the Gym Leader will first be in the Contest Hall.
pancakes
The water Pokemon gym leader is in Pastoria City.
The eighth gym leader in Pokemon platinum is the one in sunny shore city.
in canalave city
in sunyshore city
snowpoint city
That'd be Volkner who remains the Gym Leader there.
The forth gym leader is in Veilstone City
he's in oreburgh city
He is the gym leader in Canalave City west of Jubilife City.
The 6th Gym Leader in Pokemon Platinum is Byron in Canalave City. He specializes in Steel-type Pokemon and has a Steel based Gym that looks like a construction site.
you go to Sunyshore City and defeat the las gym leader
go to hearthome city