E19 : Subseven Sanctum's puzzle

[Black Hoof]

Spoiler

In the Dialga/Palkia quest, with the limited "walk through walls" statues, I have found the green, red and purple Arceus statues' buttons, beat 4 cultists and triggered 3 dialogues, but I've been unable to progress further. I've searched for hours but no success... Can someone help me?

 

[Vibes]

Spoiler

Did you get the blue statue? its in the cell where you start.

 

[Black Hoof]

28 minutes ago, Vibes said:

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Did you get the blue statue? its in the cell where you start.

 

I hadn't thought about checking there... Thanks!