How Do You Get To The Shadow Pokemon Lab?

The way to the mysterious Shadow Pokemon lab will be shown to you by Sierra Noviena. She is Master Ein's little sister and doubles up as his direct subordinate as well. While you're on your way to Realgam Tower, you suddenly remember that a while back you spotted a strange laboratory. It was dark and surrounded by an electrical fence. Since you have some time on your hands before the tournament begins, you feel you might as well check it out. Luckily that's when you will meet Sierra, if you're polite and courteous towards her then she will take you to the lab.

Once there she opens the front gate and you follow her inside. The labs a dingy abandoned place, but Sierra tells you that Ein dropped by earlier to clean up the place and make sure nothing of value has been left behind. She leaves soon after and you can have free rein of the place.