Where to find the galactic grunt that drops the key in Veilstone city

First go to SnowPoint City and you will find team galactic garding the lake so you have to beat the gym leader then go back to the lake and go to the lake and you will find you freind and a galactic leader then she will come to you an talk and then after she fineshs talking go to veilstone city and go the the galactic house and talk to the galactic grunt and then you will get the key