You enter the Power Plant.  You see no people here -- it appears to be operated solely by computers.  You start to explore, but before you can take 3 steps, some wild Pokemon that call this place "home" emerge and attack you!
Fight Wild Pokemon (Lv 12)

After that battle, you work your way deeper into the place, cautious to make sure you're not confronted by more wild Pokemon.  You make your way to the opposite end of the Plant, where it's really dark and shady.  All of a sudden, you hear a noise.  You wonder if you're actually alone in here...
Fight (Lv ???)

After that confrontation, you are in a hurry to get out of the place.  Luckily, you spot a back door to the plant and get out.