I can't find the Portal to xerosic in the secret room in lysandre labs?

Question

I swear I've checked every one. I just can't find it. Please include a map of lysandre labs in your answer, it would be much appreciated.

Comments

If i remember right u had to go downstairs to the dungeonarea no portals there just use the elavator if u have access to it also i think it is where AZ is imprisoned or someone was anyway

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No I'm talking about the post game looker quest secret floor
How do you get to xerosic and essentia?

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Oh sorry

Answer 1

https://www.thonky.com/pokemon-x-y/lysandre-labs

This walkthrough guide has proven quite useful to me, and details exactly what you have to do to advance through the story, or Lysandre Labs in this case. Be wary of spoilers though. There's a few in this guide.