Japanese Mega Dream ex Booster Box

The set will be headlined by Mega Dragonite ex!
The set will also feature a large number of Mega Evolution Pokemon. There are currently 49 Mega Evolutions, with more to come in Legends: Z-A.
There will be a new rarity called “Mega Stone Mirror.” 
MEGA Dream ex will be Japan’s annual High Class Pack set. Each booster pack will contain 10 cards instead of the usual five, including a guaranteed hit.