tldr; Start of XY2: Sally the Destroyer -> Dragon Wars -> Revenge of the Lower Tier Megas
No matter what happens, expect a huge rise in usage of CB Adamant Smogon Berds:
Mega Salamence:
Man and I was thinking that the only saving grace that would keep this beast in OU, at least for more than one month was if they avoided any boosts to his speed, but no they went ahead and Uber'd it from the start.
What can I say that isn't displayed in his stats? Why calcs ofc:
252 Atk Life Orb Weavile Ice Shard vs. 0 HP / 0 Def Salamence: 265-312 (80 - 94.2%) -- guaranteed 2HKO
244 Atk Life Orb Mamoswine Ice Shard vs. 0 HP / 0 Def Salamence: 270-328 (81.5 - 99%) -- guaranteed 2HKO
Expected popular set:
Mega Sally @ Sallystone
Adamant/Naive Nature
252 Atk/252 Speed/4 SpA
EQ/ Fire Blast
Dragon Claw/Outrage
Double Edge/Return
Dragon Dance/Roost
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Mega Altaria:
It's here! The famed Dragon/Fairy typing, which is infamous of having no overlapping/redundant resistances and actually has an immunity to the others weakness! This thing throws everything you know about coverage off the cliff and will force some very weird, perhaps even insulting realities on Dragons like CharX and Dragonite who might even run Iron Tail just to ensure their viability!
While the stats look like someone ripped off Kingdra and gave him a bag of weed, he does have Pixelate and the typical Dragon/Mew-esque movepool to pull off many suprises, look out for this one and remember the following:
Resists: Fire/Water/Grass/Electric/Dark/Fight/Bug
Immune: Dragon
Mega Cloud @ Cocaine
Naive Nature
252 Atk/252 Speed/4 SpA
Dragon Dance/Roost
Outrage/EQ
Fire Blast
Return
Somehow I don't think people will resist trying to turn it into a defensive titan and stick it to a stall team or something...
Mega Cloud @ Cocaine
Calm
252 HP/252 SpD/4 SpA
Roost
Toxic
Flame Thrower/Fire Blast
Cotton Guard
244 Atk Life Orb Mamoswine Icicle Crash vs. +3 252 HP / 0 Def Altaria: 133-159 (37.5 - 44.9%) -- guaranteed 3HKO
4 SpA Pixilate Altaria Hyper Voice vs. 0 HP / 0- SpD Mamoswine: 160-189 (44.5 - 52.6%) -- guaranteed 2HKO after Stealth Rock
252 SpA Mega Charizard Y Fire Blast vs. 252 HP / 252+ SpD Altaria in Sun: 109-129 (30.7 - 36.4%) -- 57.6% chance to 3HKO
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Mega Sceptile:
Grass/Dragon! Walled by everything! An electric immunity for a pokemon that resists x4 Elec and looks like a XMAS tree! WEEEEE....
Ok stop it already, you are not looking correctly at the big picture, this pokemon is a dragon...what else, yes OU has finally gotten a scarecrow for the likes of Rotom-W and prankster Thundrus-I, and with his impressive mixed capabilities and phenomenal speed, this thing is surely can make a lot of people sweat, especially if he pulls of unpredictable sets.
Mega Sceptile @ Sceptilness
Jolly Nature/Naive
252 Atk/252 Speed/4 SpA
Sword Dance/Sub
Outrage
Leaf Blade
Low Kick/HP Fire
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Mega Slowbro:
You didn't think Ninny went ahead and released a Reggae song for it without having a master plan behind all that Yadon? This is Crocune.2 in all but name, and whilist the outdated version had impressive bulk but no recovery, Megabro went ahead and brought Slack Off, Amnesia and even Iron Defense to the stall party. Are you ready to face death itself?
MegaBro @ Comeatmebro
Bold
252 HP/252 Def/4 SpA
Scald
Amnesia
Slack Off
Iron Defense/Toxic
====================
Mega Metagross:
God Dammit, they only had to give it 150 Atk to 2hko Skarmory with T-Pwnch...oh well, just throw SR at one point of the game and you can go along and annoy people on PS by your oh so clever and witty Transformer references (e.g. Megatron). But srsly look at that speed! Look at those stats, this thing is bulky and its here to stay and punch for hours to come
MegaGross @ OrbofSigma
Adamant
252 Atk/252 Speed/4 HP
Agility
Zen Headbutt
Meteor Mash
EQ/Thunder Punch
=====================
Mega Lopunny:
HA! WHOSE WEARING THE PANTS NOW DIG...oh you got elemental punches, knock off and everything else under the sun, mkay, how about UNRESISTED COVERAGE! GO FIX ME SAMMICHES.
^The above was recorded yesterday as a result of smogon's careless datamining effort to ruin what was once a harmonious house and blissful marital life.
136 Attack, Scrappy, High Jump Kick, Elemental Punches, outspeeds everything not scarfed, this is your new primer fighting type and getting massacred has never been so cute before!
MegaPunny @ Ghostbuster
Jolly
252 Atk/252 Speed/4 HP
Hi Jump Kick
Fire Punch
Return
Ice Punch/Sub
===================
Mega Beedrill:
This was probably many peoples first fully evolved pokemon, and many peoples first deposit in bills box. Whose great idea was it to piss off the hornet's nest for all these years, not even meriting a mention at PU? Well it's now time for revenge, having returned not only with 150 ATK and 145 Speed (srsly gf), but with ADAPTABILITY.
It's rape time gentlemen, and Beedrill has put on his true face.
DOES THIS LOOK LIKE THE FACE OF MERCY TO YOU?
MegaDrill @ Bendover
Adamant
252 Atk/252 Speed/4 Def
U-turn/X-Scizzor
Drill Run
Poison Jab/Knock Off
Sword Dance/Sub
+2 252+ Atk Adaptability Beedrill X-Scissor vs. 252 HP / 88+ Def Ferrothorn: 436-514 (123.8 - 146%) -- guaranteed OHKO