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there are no team galactic grunts in that game. only team rocket, and they are not at lake of rage.
Mars does not appear at lake acuity. If you beat mars at lake verity then go to the upper part of mt coronet and explore until you reach snowpoint city. If you're at lake acuity and beat Jupiter then go to the galactic HQ in veilstone city.
get to lake acuity the first time and the team galactic members will stop you so then go to the snow point city gym leader and battle her and defeat her and the team galactic grunts will go away. then go inside and you will see your rival helping galactic boss Jupiter out of the water and will know the he is a fool to help Jupiter and will go away crying. after this you are allowed to go to to sunny shore city.
In Pokemon Platinum, the player has to defeat several Galactic Grunts and Commander Saturn to get them to leave Lake Valor. This happens after Team Galactic uses a bomb to dry up the lake.
use surf to get to canalave city where your friend will talk to u next go to the library(uper right coner top floor)then you will fell a explosen then go to the lake they will be gone.