just go to hart home city to Bebe and then she gives you the TM move water up (i hope it will work for you)
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In the water of Lake Verity
water stone = lake near crash
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.
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