Question

Where do you get the mega stone for Gallade and do you need to have beaten the Pokemon League?

Comments

You won't regret the Delta episode. Its one of my personal after game things in the franchise.

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...Okay?

Answer 1

You can get Mega Stone for Gallade from Professor Cozmo in Delta Episode that means you have to beat the Pokemon League.

Source 1
Source 2(for picture)

Comments

Shoot, I wanted it before the league