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Of the ones in the OP picture, these are my predictions. There were 30 mega evolutions in X/Y (even including the ones not released), so I chose 30 for this, including the starters (though I guess this sort of overlaps Blaziken, but eh..). I think that one of their themes for megas in X/Y was sort of version exclusives/counterparts, so I'm assuming either Seviper/Zangoose, Solrock/Lunatone, Plusle/Minun or Shiftry/Ludicolo will get them. I feel like either or both of Metagross and Salamence are going to get one because muh pseudos, and everyone is talking about Camerupt/Sharpedo so I feel like that's also likely. I do think that Milotic will get the Gyarados treatment and be given a water/fairy mega. The rest were just personal preference.