You have to go through mt. coronet and get to snowpoint city. If you go into every house a guy will say he lost his hm. Go outside and near his house is the hm rock climb. Go back in and he gives you an icicleplate I think
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You beat the 6th gym leader.
beat the 4th and 5th DA
the 6th gym leader is in fortree city after the weather station where you get castform
i'm pretty sure you get it from Koga when you beat him(Koga is the 6th gym leader)
In Pokémon Platinum, the 6th Gym Leader, Byron has Steel-type Pokémon. The Steel-type Pokémon that he has during the first match until you beat him are Magneton, Steelix and Bastiodon.