Why can't I find the remaining mega evolution stones?

Question

I've beaten the Elite 4 multiple times, and yet Professor Sycamore will not come to Anistar to upgrade my evolution ring.
Is there something else I need to do? Is there another item I need?

Answer 1

After the player has beaten their rival in Kiloude City, Professor Sycamore will upgrade their Mega Ring at the Anistar Sundial by having the player touch the sundial. Once upgraded, the player can then find hidden Mega Stones around Kalos from 8:00 PM to 9:00 PM.

All you need to do is defeat your rival. He/she will appear once you try out a battle in the Battle Maison.

Your rival will appear here:

Defeat him/her in a battle, then go to Anistar City at the Sundial to upgrade your Mega Ring.
Source

Comments

I think that might be it....  I did not battle in the Maison....  thanks will try now.