The Power Plant Pass is required to enter the facility.
You need the Power Plant Pass, which you can find on Route 13 (in the rock next to the Team Flare Grunt).
I have the pass, what I want to know is why the other doors won't be unlocked by it and why they are locked.
commented 3 hours ago by thomastank1
Game Freak had no reason to mke those doors unlockable, they were probably just for decoration.
Or they just forgot to implement it, sometimes stuff like that gets removed to save budget or for some other reason (it was bugged, legal issue, etc. etc.)