Mega Sceptile, Grass/Dragon, Lightning Rod. 70/110/75/145/85/145
Thoughts: Hrm... in terms of OU, this is a bit of a mixed bag. Literally, it's best set seem to be mixed right now - but seriously, stat boosts seem to be in all the right place. It's ability is obviously only good for cockblocking volt switches and t-waves; no competent player is going to let it get that +1 boost. I'm sure a lot of people are let down by the fact it's not a physical sweeper, but this thing still does work - Naive 176 speed lets you outpace everything relevant that you can possibly outspeed and then you can split the offensive IVs to whatever you like; Leaf Storm, HP Ice/Ground, Dragon Pulse and Focus Blast are all very, very good special options, while you get Outrage, Earthquake and Low Kick on the physical. With this set you can really get off some high-powered outrages and leaf storms to obliterate a lot of 'mon that you outspee with dat base 145, but unfortunately you've got a ton of counters too. Even with that small defence boost you're still relatively frail; scarfers are gonna have a field day with you as are Weavile and Mamoswine, not to mention Birdspam being everywhere. Then when you consider everything else competing for the Mega Slot, I think this thing, while powerful, will achieve a place somewhere in the B ranks.
Mega Swampert, Water/Ground, Swift Swim. 100/150/110/95/110/70
oml this thing is fucking insane. rain dance, waterfall, eq and ice punch/hammer arm wrecks most the entire meta I'm not even kidding. adamant 252 speed outpaces literally everything but a few scarfers but who the fuck cares, you're too busy wrecking everything not called ferrothorn to care. I really don't see many flaws to this thing, easy A ranks, hell might even be S rank (k maybe that's pushing it but for srs this thing's stupid good)
Mega Waifu 2.0, Rock/Fairy, Magic Bounce. 50/160/110/160/110/110
Here's ANOTHER stupid good thing but unlike cute swamp monster thing ain't getting enough attention. But I mean are you kidding me, just look at this thing. Insane STAB, nice coverage with earth power, magic bounce says fuck you to willo and t-wave, offences that make mega zard x jelly, one of the best speed tiers in the meta. Mixed set with Moonblast, Earth Power, Diamond Storm and uh... I dunno calm mind or something is something I'm personally scared for. wrecks birdspam in two, doesn't give a fuck about dragons, wallbreaking prowess is scary. Course, it hates priority e.g. bp and aqua jet more than ever, it'll have trouble megavolving due to her tiny tinnnny base form speed and she'll find it hard going anything more than mixed because ofc they had to make diamond storm physical and not give her play rough; thanks gf. rank's hard to tell; probably hovering somewhere around B and A-
Mega Sableye, Dark/Ghost, Magic Bounce. 50/85/125/85/115/20
dear gf plz stop giving everything magic bounce espeon's crying in her trailer
This thing's hard for me to comment on. It really seems like it's hard to say anything about it without trying it out; I don't think theorymonning's gonna get me anywhere. That said, a lot of people here have said it's really damn good, and considering how good and viable Sableye is as is I find it hard to not claim thing thing as really good, especially for stall. Probably lingering in B+, but that's a really big guess since I just can't find myself saying anything about it. adorabu tho
Mega Metagross, Steel/Psychic, Tough Claws. 80/145/150/105/110/110
Oh look here's ANOTHER thing I don't know what to feel about. Well... at least on paper, this thing seems insane. 145 attack boosted by tough claws backed up with lati speed and some great coverage? sign me the hell up
Unfortunately I'm finding it hard to say much about it. While tough claws with insane attack would usually be amazing, unlike zard x it... eh... doesn't exactly have an impressive STAB combination. Steel has gotten really nice this gen offensively tho; it's gonna slay every fairy not called azumarill and I can honestly see a tough claws set working with some STAB and a coverage move like ice punch or even grass knot. Actually what am I talking about it's STAB is the only possible downfall here and STAB Steel really ain't that bad; it's even got priority, stupid good defences - maybe a tank or stall set would work? A few of these new megas seem to work for stall but also have really high offensive stats. Everything said and done, this thing looks really versatile and really scary, even getting rid of Metagross' biggest new flaw this gen: knock off. Having said all that... I think A- sounds about right for it.
Mega Fluff, Dragon/Fairy, Pixilate. 75/110/110/110/105/80
Looking at those stats, only one word comes to mind - Versatile. Stat Boosts, while seemingly jack of all trades master of nothing, really seem to be in all the right places to let Altaria fill a ton of roles. Dragon Dance, Defensive, Special, Tank... it's got the movepool, it's got the stats, and HOLY FUCK DOES IT HAVE THE TYPING. Dragon/Fairy is honestly what makes this thing; without it Altaria would probably fall apart and go down to the lower tiers. But nope, it decides to get a unique typing which looks to be one of the best ever in terms of defence, get it's offences and defences jacked up and suddenly make our dragon dancing pixilate dreams come true. Easy OU, A rankings for sure.
Mega Lopunny, Normal/Fighting, Scrappy. 65/136/94/54/96/135
Gotta admit, when I first saw this thing in Corocoro, I thought it was going to head for UU. Based on XY's general Mega Stats, I thought it'd be lucky to even get 121 Attack and around the same for speed, making it kinda meh in comparison to everything else. But then just like most every ORAS mega, it's stats surprised the hell out of us when it decided to get stats which makes it look like Mega Man's physically orientated sister. With scrappy, it's STAB coverage is unresisted and with the high based power of Return and HJK, coming off of 136 Attack it's going to hurt. And because of this insane power and unresisted coverage, what else it runs is totally up to you - Ice Punch? Healing Wish? Encore? Sub + Baton Pass? It's incredibly versatile, stupidly strong and most likely whatever you pick will let it be very effective. Only problem is this is a really bad typing offensively, especially with all the birdspam around... and uh... I guess conkeldurr's mach punch??? It's also relatively frail so thank heck it got mega man speed, it's gonna need that. Unfortunately, with all the other Megas around, I don't think it'll be easy to justify an A rank. Way too good for C ranks tho.
Mega Broken as hell, Dragon/Flying, Aerilate. 95/145/130/120/90/120
Oh my fucking lord we're doomed. I give this thing two weeks 'till it gets a suspect, I know we're not allowed to talk about bans but this thing honestly scares me. Hell who DOESN'T it scare? It's about the epitomy of perfection, it's incredibly versatile, stats are all in the right places, it got the perfect ability, Return + Outrage is all it needs and then it just subs, roosts, dragon dances, whatever it wants and there ain't anything you can do to stop it. Maybe greninja can take it out with ice beam before it dances? That's honestly the only thing I can think of that can take this down; nothing wants to face this 1-1. Viable in Ubers, wrecks OU, what can I really say other than one of the best Pokémon in the tier? S-rank for sure.