How do you get the galactic key

first go into the ware house in veilstone city.then open the door,go downstairs.go straight fight the grunt then go straight again fight the other grunt,go upstairs and again fight the grunt .there are 2 warps go to the left warp.then go to the other warp and upstairs.once that is done go down to the yellow warp then go downstairs.go into the little room and fight the scientist then go down stairs go straight then down. in the pokeball you will find the TM sludebomb and in the other poke ball you will find the galactic key