SHAYMIN-S IN OU. 
  
    "Oh no, what the fuck is swift saying now?" 
    
Yes, skymin in OU. This will be a writeup similar to the one mien wrote for lugia. So just hear me out, kay? 
    
No really, put down the pitchforks and hear me out! 
    
    
    So Swift, why skymin? 
    
Well, to put it simply, I believe that skymin is OU. I've thought so ever since the first suspect round of gen V. 
    
Do you remember round 1? We had deoxys-A, darkrai, skymin, manaphy ect.  in OU at the time. It was hectic. Everything felt unbalanced and broken,  right? When voting time came the broken pokes were thrown out of OU. Do  you remember the percentage of votes for uber skymin recieved? 
    
    100%
      
    100% Everyone. Every single voter chose to get rid of skymin.  You might argue that it was broken, so the % was deserved, but do you  seriously think that it was worse that deoxys or darkrai? Darkrai caused  so much stir that a policy review thread was created to discuss banning  sleep moves! 
    
100% says bias to me. In a metagame where everything felt new and  broken, skymin stood out as the most annoying. This is why everyone  wanted to ban it. You can argue that there was a lot of deliberation,  and the voters made an educated decision (no offense to the voters) but  skymin wasn't worse than the other three. Not nearly enough to garner a  unanimous vote. A lot of people argued that shaymin was manageable  enough to stay in OU, and there was a decent case to be made, but I'm of  the belief that it got caught up and thrown out with the rest. 
    
    Okay, so you think it's OU. Now you have to convince us. 
    
Yes, the hard part. mien tried this and was ridiculed. That won't work. Draw parallels? Nope. Examples? 
    
I've decided to go with Damage Calculations and Examples. (yay!) 
    
So. The most common skymin set was the subseeder:
    
[SET]
 name: Subseeder
 move 1: Substitute
move 2: Leech Seed
move 3: Seed Flare
 move 4: Air Slash
 item: Leftovers
nature: Timid
 evs: 4 Def / 252 SpA / 252 Spe
    
388 speed ties with neutral base 80s (259) with a scarf. It's beaten by  base 130s and max speed base 70 scarfers (393) It's not especially  powerful, but can be hard to work around for the average poke. Grass  types are immune to it's leech seed and resist seed flare, but have to  watch out for air slash. It's STAB moves give it great neutral coverage,  but it can be walled by many pokes if it doesn't run a coverage move. 
    
I've picked out a few prime candidates to take it on: Skarmory, Rotom-H,  Bronzong, Heatran and Cresselia (of course!) I'm going to make this as  comprehensive as possible, going through everything in OU, and  brainstorming some UU stuff as well. 
    
Oh, and I'm going to leave the numbers as is for accuracy's sake. I can't guess the percentages accurately. 
    
First up is skarm. (*squawk!*) I'll be using the above skymin set for  all calcs, and skarm will use both the standard set and the specially  defensive one in the analysis (people use this, right?) 
    
Seed flare on physical skarm: 62 - 73 out of 334
    
Seed flare on -2 physical skarm: 124 - 146 (not even a 2HKO) 
    
Air slash on physical skarm: 78 - 92 (5HKO with leftovers) 
    
Air slash on -2 physical skarm: 155 - 183 (barely a 2HKO with leftovers) 
    
HP fire on physical skarm: 194 - 230 (a 2HKO) 
    
    Specially defensive skarm: 
    
Seed flare: 42 - 50 (ROFL) 
    
Seed flare, -2: 85 - 100
    
Air slash: 54 - 63
    
Air slash, -2: 106 - 126 (4HKO) 
    
HP fire: 134 - 158 (still not a 1HKO) 
    
    
Skarmory's minimum attack brave bird on skymin: 270 - 320 (KO with rocks) 
    
Brave bird with 48 attack EVs: 288 - 342 (minimum attack EVs needed to OHKO. 208 EVs guarantee a OHKO.) 
    
    Rotom-H 
    
The cool thing about this cute little oven is that it resists ALL of the  moves that skymin commonly runs (grass, flying, ground, fire and ice)  and it's dual STAB moves can deal with skymin easily. There was no bulky  set in the analysis, but I'll opt for a 252 HP / 4 SpA / 252 SpDef  lefties set. 
    
Seed flare: 63 - 75
    
Seed flare, -2: 127 - 150
    
Air slash: 40 - 48
    
Air slash, -2: 80 - 94
    
    
Rotom's overheat on skymin: 402 - 474 (OHKO)
    
Thunderbolt: 135 - 160 (not a 2HKO, but will break subs.) 
    
This all looks good, so I'll calc a min/min rotom (241 HP) now: 
    
Seed flare: 87 - 103
    
Seed flare, -2: 174 - 206 (Two seed flares will KO with a drop.) 
    
Air slash: 54 - 65
    
Air slash, -2: 109 - 129 
    
Max special attack rotom: 
    
Overheat: OHKO
    
Thunderbolt: 186 - 220 (guaranteed 2HKO) 
    
    
    Bronzong 
    
Standard wall set from the analysis (338 HP). 
    
Seed flare: 68 - 81 
    
Seed flare, -2: 136 - 161 
    
HP fire: 108 - 128
    
HP fire, -2: 214 - 252
    
    
Gyro Ball (150 base power)  on skymin: 204 - 240 (OHKO with rocks) 
    
    
    Heatran 
    
I'll use both a min/min and max/max set (offensive and specially defensive.) 
    
Seed flare on min/min (323 HP) heatran: 44 - 52 
    
Seed flare, -2: 88 - 103 
    
Air slash: 55 - 66
    
Air slash, -2: 110 - 130 
    
Earth power: OHKO
    
Seed flare on max/max (386 HP) heatran: 31 - 37 
    
Seed flare, -2: 63 - 75 
    
Air slash: 40 - 48
    
Air slash, -2: 80 - 94
    
Earth power: 256 - 304 (2HKO with rocks!) 
    
    
Min special attack flamethrower on (341 HP) skymin: 324 - 384
    
Max: OHKO (even with timid) 
    
    
    Cresselia 
    
120 / 130 special defense stats. Max/max set will be used. Max HP is 444. 
    
Seed flare: 111 - 132
    
Seed flare, -2: 222 - 262 
    
Air slash: 70 - 84 
    
Air slash, -2: 139 - 165 
    
    
Ice beam on skymin: OHKO 
    
    
    Ferrothorn 
    
252 / 248 set will be used. Max HP is 352. 
    
Seed flare: 30 - 36 
    
Seed flare, -2: 60 - 71
    
Air slash: 76 - 90
    
Air slash, -2: 151 - 178 
    
HP fire: 188 - 224 
    
    
Gyro ball on skymin: 193 - 228 (2HKO, will break subs.) 
    
    
    Chansey 
    
Max HP/min spdef eviolite set. Max HP is 704. 
    
Seed flare: 118 - 141 
    
Seed flare, -2: 267 - 315
    
Air slash: 75 - 88 
    
Air slash, -2: 168 - 198 
    
    
Ice beam on skymin: 156 - 188 (may 2HKO) 
    
    
Tyranitar 
    
Max HP min special defense set will be used. Adamant and leftovers. Max HP is 404.  
    
Seed flare: 248 - 294 
    
Seed flare, -2: OHKO 
    
Air slash: 39 -46 
    
Air slash, -2: 87 - 103 
    
    
Stone edge on skymin: OHKO 
    
Crunch: 186 - 220 (2HKO) 
    
    
    Latios 
    
Standard offensive set. Leftovers will be used. HP is 301. 
    
Seed flare: 85 - 101 
     
 Seed flare, -2: 170 - 201 
     
 Air slash:  108 - 127 
     
 Air slash, -2: 213 - 252 
    
    
Dragon pulse on skymin: 186 - 220 (guaranteed 2HKO) 
    
    
    Excadrill 
    
Adamant life orb. HP is 361. 
    
Seed flare: 262 - 310
    
Seed flare, -2: OHKO 
    
Air slash: 82 - 97 
    
Air slash, -2: 165 - 194 
    
HP fire: 206 - 244 
    
    
Rock slide on skymin: 304 - 358 (KO with rocks) 
    
    
    
    Reuniclus 
    
Life orb max HP/max Def calm minder. HP is 424. 
    
Seed flare: 211 - 250 
    
Seed flare, -2: OHKO
    
Air slash: 133 - 157 (3HKO) 
    
Air slash, -2: 265 - 313 
    
    
Psychic on skymin: 195 - 229 (2HKO) 
    
    
Now the same calcs with one calm mind: 
    
Seed flare, +1: 142 - 168
     
 Seed flare, -1: 316 - 373 
     
 Air slash, +1: 88 - 105  
     
 Air slash, -1: 198 - 234 
     
     
 Psychic on skymin: 289 - 342 (Chance to OHKO, guaranteed with rocks.) 
  
  
  Thundurus 
  
Support set with max special attack and speed, leftovers, tbolt, hp ice and thunder wave. HP is 299. 
  
Seed flare: 111 - 132 
     
 Seed flare, -2: 222 - 262 
     
 Air slash: 69 - 82 
     
 Air slash, -2: 139 - 164 
  
  
Hp ice on skymin: OHKO 
  
  
  Conkeldurr 
  
  120 HP / 252 Atk / 136 SpD bulk upper from the analysis. HP is 381. 
    
Seed flare: 219 - 258 
    
Seed flare, -2: OHKO 
    
Air slash: 272 - 324 
    
Air slash, -2: OHKO
    
    
Stone edge on skymin: 318 - 376 (KO with rocks.) 
    
    
    Deoxys-S 
    
Max special attack, max speed, lefties. HP is 241. 
    
Seed flare: 204 - 240 (99%) 
    
Seed flare, -2: OHKO 
    
Air slash: 127 - 150 
    
Air slash, -2: OHKO 
    
    
Ice beam on skymin: OHKO 
    
    
    Politoed 
    
Specs, scarf and defensive sets from the analysis. 
    
Specs (321 HP) 
    
Seed flare: OHKO
    
Seed flare, -2: OHKO 
    
Air slash: 117 - 138 
    
Air slash, -2: 231 - 273
  
Ice beam on skymin: OHKO 
  
              
            Scarf (321 HP) 
  
Seed flare: OHKO
  
Seed flare, -2: OHKO 
  
Air slash: 117 - 138 
     
Air slash, -2: 231 - 273
  
Ice beam on skymin: OHKO 
  
  
Defensive (384 HP) 
  
Seed flare: 372 - 438
  
Seed flare, -2: OHKO 
  
Air slash: 117 - 138 
  
Air slash, -2: 231 - 273 
  
Ice beam on skymin: 316 - 376 
  
  
  Ninetales 
  
Specially defensive is the first set in the analysis, so I'll use it. 252 HP / 92 SpD / 164 Spe timid. HP is 350. 
  
Seed flare: 84 - 99 
  
Seed flare, -2: 169 - 199 
  
Air slash: 106 - 126 (4HKO) 
  
Air slash, -2: 211 - 250 
  
Flamethrower on skymin: 324 - 384 (KO with rocks) 
  
  
  Virizion 
  
252 special attack and speed, timid and leftovers. HP is 324. 
  
Seed flare: 75 - 88 
  
Seed flare, -2: 148 - 175 
  
Air slash: OHKO
  
Air slash on 252 HP / 252 Spdef calm virizion (386 HP) 280 - 336 
  
HP ice on skymin: 304 - 360 
  
  
  Volcarona 
  
252 HP 0 spdef. Bulky quiver dancer. 
  
Seed flare: 44 - 52 
  
Seed flare, -2: 88 - 104 
  
Air slash: 222 - 264 
  
Air slash, -2: OHKO 
  
Air slash, +1: 150 - 176 
  
  
Fiery Dance on skymin: 284 - 336 
  
Fiery dance, +1: OHKO 
  
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So there, a wall of calcs. This has taken me all night, so I'll continue tomorrow.