Pokemon Legends: Z-A can herald Mega Evolution's return to the series while also rebalancing it with some assistance from the Terastallization mechanic. The debut trailer for Pokemon Legends: Z-A gave players a lot to theorize over, with Mega Evolution being one of the topics. As a mechanic that has received a lot of attention despite its relatively brief run in the main series, Mega Evolution is something that will seemingly always draw a lot of interest. It looks like Pokemon Legends: Z-A is set to give Mega Evolution another appearance, and it could make an important change as well.