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.
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In the house you first see after entering the Lake of Rage.
in the Pokemon league
there are no team galactic grunts in that game. only team rocket, and they are not at lake of rage.
by snowpoint city.
In the water of Lake Verity