u/Beep_and_Know_Things

I've opened up to Regirock before, but being the idiot I am, forgot to save after. Now, I'm trying to redo the Regis, and it won't open. Don't know if it's just me being daft, but I'm sure I've done the puzzle right.

Checked on the wiki, and this is what it shows. But I only get the sound effect for correct placement with the centre stone. Is this a bug? Have I done the puzzle wrong? Or am I just daft and have missed something completely.

Already done Regice and Registeel

It's been a long time since I played any pokemon game. Picked a good one to get back into it with.

I guess its time to play it again?