Pokémon can only Mega Evolve when they are holding a Mega Stone. It’s not yet known whether the Mega Stone is one specific item, or a separate one such as the Blazikenite that the event Torchic holds. It also confirms that Mega Evolutions are temporary in battle.
It confirms that not all Pokémon will have Mega Evolutions. The Master Tower has a connection to Mega Evolutions
It also confirms stat increases, stating that MegaLucario’s Attack is higher. MegaAbsol has increased Attack & Speed. Finally, it also confirms that Super Training will increase Pokémon’s “Kiso” Points. The translation of it indicates that this may be what we call EVs. Next month’s CoroCoro to feature new Pokémon, new Mega Evolutions and type chart featuring the Fairy-type -serebii