Ok about diancie, its formerly a carbink and thru what I have read, pressurization turns it into diancie. Thats the same as onix into steelix. So, nintendos gonna have to allow carbink to evolve into diancie.
Mega Diancie is going to become so strong lol. All Megas so far have gained 100 in BST - anyway you spread these out to Diancie means it becomes ridiculously strong.