Can I get Mega Stones from Red for defeating him in Multis or does it have to be Singles?
According to this, you can get Venusaurite, Blastoisinite, Charizardite X, and Charizardite Y when defeated Red only in Single Battle Challenge.
According to this, you can get Venusaurite, Blastoisinite, Charizardite X, and Charizardite Y when defeated Red only in Single Battle Challenge.