Pokemon XY: A New Announcement This Monday! Related To XY? or Somethig Completly New (WiiU Title?)

[TheKingofRedLions]

Panama said:
Either these Megas will make the meta into a bumbling mess or they'll blow it wide open.

Has it been confirmed that every Pokemon will have a mega evolution or is it only a select few?

I don't think everyone is supposed to be getting a Mega, right?