Keystone (Mega Evolution)
The Keystone is a key item that is required in order to perform a Mega Evolution, which a few Pokemon can do in Pokemon Ultra Sun and Moon.
Even if you have a Mega Stone for a specific Pokemon, you won’t be able to use its Mega Evolution if you do not have the key item.
How to Obtain
You can get the Keystone after defeating Dexio in front of the entrance of Poni Meadow. Dexio and Sina will be waiting for you in the area.
If you win the battle, you will receive the key item as well as an Alakazite.
However, they will only appear after you are inducted into the Hall of Fame.
I’m still confused though because where do I find that stuff
I’m still confused on where that stuff is though.
This is really helpful because I got almost all of the mega stones and I just couldn’t find the key stone and thank you very much.????