[Other Options]
<p>Psycho Shift is a decent option on any of the sets besides Choice Specs. Opponents will frequently try to take down Latias with Poison or Paralysis, and Psycho Shift is a great way to turn the tables on any team that employs this strategy. Beware, though, as Psycho Shift will not clear your status if the foe is already afflicted by a status of their own, so it is probably not a good idea to have Latias take a Toxic or Thunder Wave from something that is already poisoned or paralyzed.</p>
<p>Latias has access to both Ice Beam and Thunderbolt, which complement each other well. However, Ice Beam is almost totally redundant due to Latias’ STAB Dragon Pulse, and Thunderbolt has pretty lackluster coverage by itself. Still, if your team has a major weakness to Gyarados or Empoleon, you may want to try out Thunderbolt, as it is Latias’ best option against either of those foes.</p>
<p>Latias’ STAB Psychic can sometimes be useful to deal with Fighting-types such as Machamp and Heracross, and its neutral damage is the same as that of Dragon Pulse (I would rephrase this bit a little, though I'm not sure how). However, Psychic had notoriously poor type coverage, and it makes Latias even more vulnerable to the already troublesome Tyranitar and Scizor. Surf or Hidden Power Fire are almost always more useful, since they deal reasonable damage to the Steel-types that frequently switch into Latias.</p>
[EVs]
<p>On the offensive sets, you should always use either 252 or 176 Speed EVs. The former will outspeed anything with lower Speed than Latias, and will allow Latias to Speed tie with other Latias and Gengar. The latter will allow Latias to outspeed any base 100 Speed Pokemon, and will give you some extra EVs to improve Latias’ attacking power or its bulk.
If your Latias is Modest, it should be given at least 204 Speed EVs to outrun +Speed Lucario and Porygon-Z. 252 Speed EVs can also be used, but the only even remotely common Pokemon this will really allow you to outspeed is Electivire.</p>
<p>The defensive sets should always run at least 28 Speed EVs. This allows Latias to outspeed any Metagross or Breloom, as well as Adamant Gyarados. If you are using a specially defensive set, then 112 Special Defense EVs with a Calm nature will let Latias switch into Stealth Rock and take two Dragon Pulses from Modest Heatran. On a physically defensive set, your best bet is to simply max out Latias’ HP, put 28 points in Speed, and everything else into Defense, as Latias’ Special Defense is high enough that Latias can take a Special hit easily, even without any EVs.</p>
[Opinion]
<p>Do not think that Latias being recently voted into OU means that it is something to take lightly. With excellent all-around stats, two powerful STAB attacks which are only resisted by one type, and a huge usable movepool, Latias is both an offensive and defensive powerhouse. Although it generally does not have the unpredictability of mixed sweepers such as Salamence and Infernape, Latias more than makes up for it with its superior overall defenses and its far superior Speed stat. Latias is the only bulky Pokemon in OU with more over 100 base Speed, a title previously held only by Garchomp.</p>
<p>Latias’ biggest pitfall is its weakness to Dark- and Bug-type attacks. It is very difficult for Latias to avoid being taken out or at least crippled by Choice Band Tyranitar, and Scizor’s U-Turn will force Latias to switch out and its switching effect will likely give the opponent the upper hand. Reflect can handle this to an extent, but Latias will still likely lose more than half its health against either of these Pokemon even with Reflect up, unless it is running a very defensive EV spread.</p>
[Counters]
<p>Tyranitar is Latias’ single greatest counter. Only the Specs set even has a chance to 2HKO Tyranitar, and if it invests in Special Defense then Latias cannot 2HKO without Grass Knot. Even if you feel uncomfortable switching Tyranitar in for fear of a Surf, it can easily revenge kill any Latias with Pursuit.</p>
<p>Scizor is probably the second most popular Latias counter. While it cannot switch into Surf or Hidden Power Fire, the majority of Latias do not run either run (<- This needs to be changed) only a Dragon-type attack or Choice Specs, meaning that Scizor can often come in and U-Turn or Pursuit while taking under 30% damage.</p>
<p>Just about any Steel-type Pokemon can easily switch into Latias, as long as it is careful to avoid Hidden Power Fire or a Choice Specs Surf. Metagross is especially good among these, since its powerful physical attacks and decent Special Defense will usually force Latias to switch or be KOed. Metagross can also use Pursuit to take out Latias even if it switches.</p>
<p>Blissey with a status move (?) makes an excellent counter to almost any Latias set, either by taking it out with Toxic or by crippling it with Thunder Wave to let a teammate finish the job. Anything with high Special Defense and Toxic, such as Vaporeon or Cresselia, can beat Latias similarly. However, if Latias is using Refresh then these Pokemon will be nothing but set-up bait, so it is strongly recommended that you pack an additional counter.</p>
<p>Latias does not enjoy taking Ice Shards, as they hit its weaker Defense stat and bypass its excellent speed. Still, Latias cannot be OHKOed by any Pokemon’s Ice shard, so if you are revenge killing with Mamoswine or Donphan be sure it has taken some prior damage.</p>
Looks good TAY. I made some grammatical and subjective changes in bold (feel free not to take any lol).
Even though it's totally up to preference, Latias, just like Cresselia, is a "she" so that could be the pronoun of choice if you want.
PS I didn't use Quote tags because I thought it would for some reason mess the whole thing up.
