This is an unusual set that I had tried to submit a while ago, which was pretty effective as a fast Statuser. It was alright, but a little weak. With the advent of Platinum, Breloom gained Superpower, and I revived my efforts when Bos on Gamefaqs also started using this set. without further adieu...
http://www.smogon.com/dp/pokemon/breloom
[SET]
name: Choice Scarf
move 1: Spore
move 2: Superpower
move 3: Stone Edge
move 4: Seed Bomb
item: Choice Scarf
nature: Jolly
ability: Poison Heal
evs: 6 HP/ 252 Atk/ 252 Spe
[SET COMMENTS]
<p>With Breloom's massive Attack and mediocre Speed he makes a natural candidate for a Choice Scarf. With a Choice Scarf equipped Breloom hits 393 Speed enough to outrun Adamant Gyarados after a Dragon Dance and OHKO it with Stone Edge the majority of the time (assuming it has been Intimidated). STAB Seed Bomb coming off of base 130 Attack will hurt anything that doesn't resist Grass, and will OHKO or easily 2HKO any Ground-, Water-, or Rock-type Pokemon not named Suicune or Hippowdon. Superpower annihilates Lucario, Tyranitar, and Normal-types, and deals more damage as a neutral attack than every other move on the set. Additionally, if Breloom didn't use Spore on turn 1 or your opponent has no sleeping Pokemon for some other reason, you may choose to use Breloom to quickly inflict sleep on any fast sweeper or wall.</p>
<p>This particular variant of Breloom can also make a respectable lead. 393 Speed allows Breloom to outrun lead Weavile (which cannot OHKO you with Ice Shard unless it runs Adamant) as well as the popular lead Azelf and Infernape. Even with maximum speed, Breloom cannot outspeed Aerodactyl, but it can still 2HKO it with Stone Edge or Seed Bomb as Aerodactyl Taunts on the first turn to avoid Spore.</p>
<p>Against almost any lead, and in particular ones that set up entry hazards, Spore is the best first turn play. If the lead cannot set up, or you suspect it may be holding a Lum Berry, you may choose to use a damaging attack instead. However, Spore is still the preferred move; if you have a way to deal massive damage to your opponent's lead, they will likely not stay in to take the hit.</p>
http://www.smogon.com/dp/pokemon/breloom

[SET]
name: Choice Scarf
move 1: Spore
move 2: Superpower
move 3: Stone Edge
move 4: Seed Bomb
item: Choice Scarf
nature: Jolly
ability: Poison Heal
evs: 6 HP/ 252 Atk/ 252 Spe
[SET COMMENTS]
<p>With Breloom's massive Attack and mediocre Speed he makes a natural candidate for a Choice Scarf. With a Choice Scarf equipped Breloom hits 393 Speed enough to outrun Adamant Gyarados after a Dragon Dance and OHKO it with Stone Edge the majority of the time (assuming it has been Intimidated). STAB Seed Bomb coming off of base 130 Attack will hurt anything that doesn't resist Grass, and will OHKO or easily 2HKO any Ground-, Water-, or Rock-type Pokemon not named Suicune or Hippowdon. Superpower annihilates Lucario, Tyranitar, and Normal-types, and deals more damage as a neutral attack than every other move on the set. Additionally, if Breloom didn't use Spore on turn 1 or your opponent has no sleeping Pokemon for some other reason, you may choose to use Breloom to quickly inflict sleep on any fast sweeper or wall.</p>
<p>This particular variant of Breloom can also make a respectable lead. 393 Speed allows Breloom to outrun lead Weavile (which cannot OHKO you with Ice Shard unless it runs Adamant) as well as the popular lead Azelf and Infernape. Even with maximum speed, Breloom cannot outspeed Aerodactyl, but it can still 2HKO it with Stone Edge or Seed Bomb as Aerodactyl Taunts on the first turn to avoid Spore.</p>
<p>Against almost any lead, and in particular ones that set up entry hazards, Spore is the best first turn play. If the lead cannot set up, or you suspect it may be holding a Lum Berry, you may choose to use a damaging attack instead. However, Spore is still the preferred move; if you have a way to deal massive damage to your opponent's lead, they will likely not stay in to take the hit.</p>