You need the HM rock climb to enter lake acuity. But you can't use that HM until you defeat the gym leader Candice in snowpoint city. You can find HM rock climb on the way to snowpoint city just lying on the ground.
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by snowpoint city.
There isn't a Lake of Rage in Pokemon Platinum. But in the Resort Area, there is a place similar. It is that big Lake in the middle. Down part is, only Magikarp lv. 1-100 can be found there.
In the water of Lake Verity
If you have Pokemon Emerald in your GBA Slot (this also works for Pokemon Pearl and Diamond) Pokemon Platinum- Route 217, Lake Acuity Pokemon Diamond & Pearl- Route 217, Acuity Lakefront, Lake Acuity
In Platinum, Houndour is found on Route 214 and in Lake Valor.