Do you mean team galactic
First get a pokemon That knows fly or walk. Fly or walk to Veilstone city. Then go down to Valor Lakefront. When you see an opening in the trees go in. Go down stairs go to left go down stairs again. Then again until you can go left at end of stairs. Go until you see a blue door. Go in battle the blue spiked hair guy. Go out and go back where you started. Go to twinleaf town go to veriety lakefront. Go in tree opening. Professor rown will be there and he will tell you to go save the girl. Go up more you will talk to the lady on the right.
I don't think there team rocket team rocket is not in the new games for ds
You have to beat the gym leader at snowpoint city then one of them leave