A Jirachi event has been announced for next month... but only in Japan. What a surprise. And of course, because it's Japan-only it has to be shiny and have an interesting event only move. I say interesting to be vague on purpose, because it could either revolutionize Jirachi play and propel it right back into OU, or do absolutely nothing like Draco Meteor did. I'm talking, of course, about Moonblast. Great choice, considering Jirachi's one of those fairy-like Pokémon that weren't retconned, and Serene Grace makes an amazing combination with it. Imagine a Calm Mind set running this thing. 60% chance of lowering special attack, on top of whatever boosts Calm Mind gets you. I'm drooling at the cheesiness here, even though physical sets are bog standard and special sets, just about never seen. Even so, if there's one thing that could make them more interesting, it's gotta be Serene Grace Moonblast (which Togekiss might also need considering its stay in OU is almost over).
As for Mega Metagross, remember that THIS IS STILL UNCONFIRMED because the scans we have so far are blurry, but it seems it will get Tough Claws as its ability. For the record, this is basically a free Life Orb boost on all of its contact moves, which include, well, every attacking move it ever uses bar Earthquake. Meteor Mash, Zen Headbutt, the elemental punches, Bullet Punch, Hammer Arm... it's safe to say that after the crushing disappointment Mega Sableye was, they knocked it right out of the park here. Unless they end up giving it a big special attack boost like they did Garchomp, I mean.
Unrelated side note: I'm amused at the fury directed at those contest Pikachus. As if we've all collectively forgotten Ukulele Pichu.