[Overview]
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As one of the most overlooked and most difficult to handle threats in  Generation 4, Breloom has both benefited from and been damaged by the  transition to Generation 4 5. On one hand, the new Ssleep mechanics make  Breloom extremely difficult to deal with. On the other, Poison Heal  Gliscor is a nearly insurmountable enemy for most Breloom sets, as it  resists Focus Punch, is neutral to Seed Bomb, and is immune to Spore  once Poison Heal is activated. However, Breloom is still an incredibly  lethal Pokemon, and its monstrous STAB Focus Punch is nothing to be  trifled with.
[SET]
name: SubSeed
move 1: Spore
move 2: Leech Seed
move 3: Substitute
move 4: Focus Punch
item: Toxic Orb
nature: Impish
ability: Poison Heal
evs: 236 HP / 252 Def / 20 Spe
[SET COMMENTS]
<p>While 60 / 80 / 60 defenses may not seem like the most  effective useful, Breloom's incredible defensive typing makes it more than  capable of taking hits from some top Pokemon in OU. Combine this with  the buff to Ssleep in Generation 5, as well as Poison Heal,(comma) and  Substitute, and Breloom can easily prove itself to be far tougher to  kill than its stat spread would imply.</p>
<p>Spore is a must-have on pretty much every Breloom set, as it is  the only 100% accuracy Sleep move in the game, and with Generation 5's  sleep mechanics, a Pokemon put to sleep often might as well be KOed.  Leech Seed goes a long way to bolster Breloom's survivability, allowing  it to wear down opponents while simultaneously refilling its own life.  Substitute compounds this by allowing Breloom to scout switches and  stall out Pokemon affected by Leech Seed. It also works especially well  on this set due to the significant healing from Leech Seed and Poison  Heal. Finally, Focus Punch rounds out the set. Even though this set has  no defensive offensive investment, it still reaches 296 Attack, and when that's  combined with a STAB 150 Base Power attack like Focus Punch, it gives a  defensive set like this one has some vicious power.</p> that was just a matter of specifying what "it" was since you had a few subjects beforehand.
[ADDITIONAL COMMENTS]
<p>The defensive investment on this set makes it surprisingly  durable. Ferrothorn is unable to break Breloom's Substitutes in one hit,  making it easy to set up on. It can also take any attack that Excadrill  can throw at it, even a +2 Adamant Life Orb Return, which does exactly 1  less damage on a maximum roll than Breloom has HP- 319 damage to  Breloom's 320 HP. This set's surprisingly powerful bulk makes Breloom an excellent way to deal with some  scary sweepers, as it can survive their attacks with ease and put them  to sleep. 236 HP EVs give Breloom 320 HP, which is divisible by 8,  giving it maximum healing from Poison Heal. Defense is maximized, and  then the rest is put into Speed.</p>
<p>This set does have a number of notable counters that need to be  eliminated for this set to function optimally. Gliscor is incredibly  hard to deal with for this set, as Poison Heal makes it immune to Spore  and counteracts Leech Seed's damage. It also resists Focus Punch, and  takes barely any damage from it. As such, it's important to have a  teammate that can either deal with it or lure it in and kill it. Expert  Belt Landorus is especially effective as a teammate since it can lure in  Gliscor and dispatch it with Hidden Power Ice. It can also deal with  another major counter, Celebi, with U-Turn.</p>
[SET]
name: SubPunch
move 1: Spore
move 2: Substitute
move 3: Focus Punch
move 4: Seed Bomb / Stone Edge / Facade
item: Toxic Orb
nature: Adamant
ability: Poison Heal
evs: 12 HP / 252 Def / 244 Spe
[SET COMMENTS]
<p>While the previous set is more defensively oriented, this set  is all power. A Mmax Attack Adamant Focus Punch from Breloom is one of  the most vicious attacks in the game, capable of OHKOing most anything  that doesn't resist it, and even 2HKOing many Pokemon that do. While  this set sacrifices durability somewhat, the increased offensive power  and additional coverage makes it much more threatening  offensively.</p>
<p>Spore is here as always, as Ssleep allows Breloom to set up for  free while also incapacitating whatever the opponent switches in.  Substitute gives Breloom the buffer that it needs to fire off its  powerful STAB Focus Punch, and works well with Poison Heal to heal off  the damage. Focus Punch turns Breloom's targets into a fine red mist,  and is a huge part of why this set is so threatening behind a  Substitute. The last move is used to provide coverage and give Breloom a  way to attack without a Substitute up. Seed Bomb is a secondary STAB move, and  also allows Breloom to do incredible damage to threatening opponents  such as Quagsire, Swampert, and Gastrodon. It also hits Jellicent, which  is immune to Focus Punch. Stone Edge hits Flying-types, such as  Dragonite,(delete) and Salamence, and Thundurus, and also does solid damage to  Gengar. Facade is the most powerful third option after the boost from  Ppoison,(delete) and provides decent neutral coverage, but doesn't have any  important super effective coverage to speak of.</p>
[ADDITIONAL COMMENTS]
<p>The EV spread on this set is simple. Attack is maximized for  optimal damage output, and 12 HP gives Breloom an HP value divisible by 8  for Poison Heal. The rest is placed into Speed in order to allow  Breloom to outspeed uninvested base 100s, as well as some uninvested or  low-investment mid-speed Pokemon with middling Speed, such as Rotom-W, Dragonite, and  Heatran.</p>
<p>As with all Breloom sets, Gliscor and Celebi give this set  hell. Expert Belt Landorus is an amazing partner for this reason, as it  can potentially lure both of them by bluffing Choice Scarf Earthquake  and then dispatching them with Hidden Power Ice and U-Turn respectively.  There are also a number of Pokemon that can cause problems depending on  the choice of third attack. Without Stone Edge, Dragonite can be a  major issue, so pairing it up with something that can eliminate  Dragonite is a good idea. Landorus fits this bill nicely, and Bronzong  can do the same while also providing Stealth Rock for the team. With  Facade, it's important to have a check to Ghost-types, as it leaves  Breloom completely unable to damage them. As such, including a strong  Pursuit user on your team such as Tyranitar or Scizor can be important.
[OTHER OPTIONS]
<p>Breloom has a couple of useful moves in its arsenal that don't see  a lot of use, but still have some niche applications. Drain Punch's  Generation 5 buff makes it a significantly more appealing option than it  was in the previous generation, but its main issue is the lack of  power (space) - Breloom's big draw is its incredibly powerful Focus Punch, and  without it, it's much less threatening. Bullet Seed's buff from 10 to 25  Base Power makes it marginally viable, as it has a 62.5% chance to have  75+ Base Power, making it comparable to Seed Bomb on average. However,  Grass isn't an especially useful multi-hit typing for a multi-hit move, considering the fact  that the big abusers of Substitute, whichare primarily resist Grass-type moves resists,  aren't especially afraid of it. On top of that, it's unreliable, which  makes it a problem.</p>
<p>While the big draw of Breloom is its devastating SubPunch sets,  it's got a few other options that it can leverage effectively. As with  all Grass-types, Breloom gets Swords Dance. This can make it an  effective sweeper, as it has access to STAB Priority in the form of Mach  Punch, and also has decent two or three move coverage. However, it  tends to lack in power, and the prevalence of Gliscor and Dragonite can  cause severe issues for it. It can also run a dual status set with both  Spore and Stun Spore, as the new sleep mechanics and Breloom's general  threat level make it unlikely that opponents will stay in, but generally  paralyzing something is less effective than simply setting up a  Substitute and preparing for some Focus Punches. An "all-out attacker"  set can also be used, with Life Orb, Superpower over Focus Punch and a  third coverage move instead of Substitute, but Breloom's comparative  frailty, low sSpeed, and lack of Substitute makes it unappealing for the  role.</p>
<p>Versions of Breloom with Choiced items versions can also be used, especially Choice Scarf, as  it can outspeed anything less than 130 base Speed and put it to sleep.  However, using Spore on a cChoice-locked Pokemon is a questionable decision, as  it largely negates the benefit of sleep, especially considering the new  mechanics. Since Breloom is forced to switch out after Spore, the  spored sleeping Pokemon can stay in and attempt to wake up. Superpower can also  be an issue, as each use weakens Breloom significantly, forcing it to  switch out afterwards. A Choice Band set can also be devastating, as a  STAB Superpower off of 591 Attack is nothing to scoff at, but Breloom is  hard pressed to switch into attacks without any investment or Poison  Heal's benefit. It can function as a decent revenge killer for stuff  like Excadrill and Terrakion though, due to Mach Punch. Still, its low  sSpeed and poor defenses are off-putting for such a role.</p>
[CHECKS AND COUNTERS]
<p>When it comes to Breloom counters, you just can't beat Gliscor.  Its massive 125 physical dDefense and resistance to Fighting-type moves allows it  to shrug off Focus Punch with ease. Poison Heal just compounds the  issue, as it renders Gliscor immune to Spore, and its passive healing  also counteracts Leech Seed's effect. On top of that, Gliscor tends to  use its Flying-type STAB more often, rather than going with mono-Ground  coverage. Put all these factors together, and you've got the perfect  Pokemon to counter Breloom.</p>
<p>Celebi is the other major counter to Breloom, as it has  excellent 100 / 100 physical defenses and resistance to both of Breloom's  STABs. It also has Recover, allowing it to effortlessly heal off any  damage that it takes from Breloom's attacks. Its Grass typing also makes  it immune to Leech Seed, which negates the major threat of Breloom's  primary set. Additionally, Natural Cure completely nullifies Spore,  allowing Celebi to essentially switch in at any time for free. Celebi  also carries Psychic or Hidden Power Fire on most of its sets, allowing it to  easily dispatch Breloom.</p>
<p>There are, of course, some other notable problem Pokemon for  Breloom. Ghost-types can be troublesome for Breloom, as they are immune  to Focus Punch and usually either faster or extremely bulky. Gengar is  especially nasty, as it resists Seed Bomb and can also use Disable to  remove Breloom's access to its coverage move. Chandelure also resists  Seed Bomb due to its Fire typing, though it has to watch out for Stone  Edge on the offensive set. Another big problem for Breloom is Pokemon  that pack multi-hit moves. Haxorus is the most prevalent, as it can  break Breloom's substitute with the first hit of Dual Chop and then  prevent the Focus Punch with the second hit. On top of that, Haxorus  resists Seed Bomb, the move of choice for the offensive SubPunch set,  and has enough defense to take a Stone Edge or Facade if need be.  Mamoswine and Cloyster can do the same with Icicle Spear, but they risk  getting caught by a Seed Bomb, and are also both weak to Focus Punch or  Superpower as well.</p>
[Dream World]
<p>Breloom's Dream World ability, Technician, is absolutely  incredible for it. Technician gives Breloom a ton of useful options, and  turns it from an irritating staller into an absolute offensive monster.  Technician turns a number of offensive options from mediocre to  incredible. The most notable one is Mach Punch, which now has the same  level of power as Scizor's Bullet Punch, but with a much better typing.  Bullet Seed also goes from 50-125 Base Power to 75-187.5 Base Power,  making it at worst only slightly worse than Seed Bomb,(delete) and,(add) at best, two  and a half times stronger, and which is even stronger than Focus Punch. Breloom  also gets two excellent STAB options in Low Sweep and Force Palm. Low  Sweep is boosted to a respectable 90 Base Power by Technician, and makes  Breloom even harder to deal with by lowering the speed of whatever  switches in by 1 stage. As a result, faster Pokemon that switch into Low  Sweep have a major chance to still be slower and have to take a second  hit from Breloom before they can attack. Force Palm has the same power,  and while it doesn't have a 100% effect rate like Low Sweep, its  Pparalysis infliction can cripple counters for the rest of the match.  This makes Breloom an incredible Choice user, as it deals ridiculous  damage with Choice Band and is nearly impossible to reliably switch  into. It also has all the power it needs as a Swords Dance sweeper, as  Mach Punch is much more usable at 60 Base Power than 40.</p>