This set isn't currently on site and the last post on the Venusaur (Update) analysis was over a month ago (and the set's write up wasn't very good either to be honest). So I'll post it here and hopefully we can get it on site soon since I have no doubt in my mind that this is one of the most popular sets in the metagame.
[SET]
name: Special Life Orb
move 1: Leaf Storm
move 2: Sludge Bomb
move 3: Sleep Powder
move 4: Synthesis
item: Life Orb
nature: Timid
evs: 4 Def / 252 SpA / 252 Spe
[SET COMMENTS]
<p>This set takes advantage of the high damage output from Venusaur’s dual STAB, while retaining the ability to take hits. It abuses the ever-present bulky Water-types, such as Milotic and Blastoise, who can barely scratch Venusaur. Chansey is not a major threat to this set either, since Sleep Powder stops her from recovering lost HP. This allows Venusaur to hit Chansey, put her to sleep before she can use Wish or Softboiled, and switch to a physical attacker that threatens Chansey. This process can be repeated every time Chansey switches in until she is in Venusaur’s KO range. This strategy only works if Venusaur doesn’t put a different Pokemon to sleep, however. Sludge Bomb and Leaf Storm are great STAB attacks with different functions: Leaf Storm is Venusaur's most powerful attack and will maim most Pokemon who do not resist Grass, but will drop Venusaur’s Special Attack by two stages. Sludge Bomb has no drawbacks but slightly less power, and hits almost every Pokemon who resists Leaf Storm for at least neutral damage (Registeel and Drapion being the common exceptions). Sleep Powder allows Venusaur to incapacitate potential checks and counters. Finally, Synthesis allows Venusaur to heal off damage taken from weaker attacks like Milotic’s Ice Beam or Azumarill’s Waterfall.</p>
<p>A Timid nature and maximized offensive stats are recommended because they give Venusaur the best chance to sweep. Even though Venusaur has no defensive EVs, he can still easily take Surf, Hidden Power, and even Ice Beam from Blastoise and Milotic thanks to his high Special Defense.</p>
[ADDITIONAL COMMENTS]
<p>Venusaur has the option of running Hidden Power to hit specific counters if needed. For example, Hidden Power Ground helps against Registeel. This can be helpful as the opponent will not expect it and may sacrifice their main counter to another one of your Pokemon, such as Swellow. Hidden Power Rock can be used to hit Moltres for an easy OHKO as well. This set can also run a bulkier EV spread of 192 HP / 252 SpA / 64 Spe with a Modest nature, which outpaces Milotic and Torterra. With this spread, Venusaur can hit harder and take hits better, but is slower than several other prominent offensive Pokemon.</p>
<p>Venusaur has trouble with one Pokemon in particular, Registeel. Registeel not only has a sky high Special Defense stat, but it also resists Leaf Storm and is immune to Sludge Bomb. Chansey and Drapion can also be a bit of a pain if Sleep Clause is already in effect. This makes Rhyperior an excellent teammate for Venusaur. Rhyperior switches into the aforementioned Pokemon with impunity and can deal monstrous damage to the opponent with a Choice Band boosted Stone Edge, Earthquake, or Megahorn.</p>
<p>Venusaur is also threatened by fast Pokemon who can switch in on a resisted attack. Moltres is able to switch into a 4x resisted Leaf Storm and OHKO Venusaur with Fire Blast. Swellow can also switch in on Synthesis (and Sleep Powder if he is already statused) and quickly KO with Brave Bird or Facade. Azumarill and Regirock help Venusaur deal with both of these Pokemon; Azumarill can switch into Moltres and revenge kill him with Aqua Jet, while Regirock walls Swellow and sets up Stealth Rock to hinder Moltres. It can also check Moltres in a pinch.</p>
[SET]
name: Special Life Orb
move 1: Leaf Storm
move 2: Sludge Bomb
move 3: Sleep Powder
move 4: Synthesis
item: Life Orb
nature: Timid
evs: 4 Def / 252 SpA / 252 Spe
[SET COMMENTS]
<p>This set takes advantage of the high damage output from Venusaur’s dual STAB, while retaining the ability to take hits. It abuses the ever-present bulky Water-types, such as Milotic and Blastoise, who can barely scratch Venusaur. Chansey is not a major threat to this set either, since Sleep Powder stops her from recovering lost HP. This allows Venusaur to hit Chansey, put her to sleep before she can use Wish or Softboiled, and switch to a physical attacker that threatens Chansey. This process can be repeated every time Chansey switches in until she is in Venusaur’s KO range. This strategy only works if Venusaur doesn’t put a different Pokemon to sleep, however. Sludge Bomb and Leaf Storm are great STAB attacks with different functions: Leaf Storm is Venusaur's most powerful attack and will maim most Pokemon who do not resist Grass, but will drop Venusaur’s Special Attack by two stages. Sludge Bomb has no drawbacks but slightly less power, and hits almost every Pokemon who resists Leaf Storm for at least neutral damage (Registeel and Drapion being the common exceptions). Sleep Powder allows Venusaur to incapacitate potential checks and counters. Finally, Synthesis allows Venusaur to heal off damage taken from weaker attacks like Milotic’s Ice Beam or Azumarill’s Waterfall.</p>
<p>A Timid nature and maximized offensive stats are recommended because they give Venusaur the best chance to sweep. Even though Venusaur has no defensive EVs, he can still easily take Surf, Hidden Power, and even Ice Beam from Blastoise and Milotic thanks to his high Special Defense.</p>
[ADDITIONAL COMMENTS]
<p>Venusaur has the option of running Hidden Power to hit specific counters if needed. For example, Hidden Power Ground helps against Registeel. This can be helpful as the opponent will not expect it and may sacrifice their main counter to another one of your Pokemon, such as Swellow. Hidden Power Rock can be used to hit Moltres for an easy OHKO as well. This set can also run a bulkier EV spread of 192 HP / 252 SpA / 64 Spe with a Modest nature, which outpaces Milotic and Torterra. With this spread, Venusaur can hit harder and take hits better, but is slower than several other prominent offensive Pokemon.</p>
<p>Venusaur has trouble with one Pokemon in particular, Registeel. Registeel not only has a sky high Special Defense stat, but it also resists Leaf Storm and is immune to Sludge Bomb. Chansey and Drapion can also be a bit of a pain if Sleep Clause is already in effect. This makes Rhyperior an excellent teammate for Venusaur. Rhyperior switches into the aforementioned Pokemon with impunity and can deal monstrous damage to the opponent with a Choice Band boosted Stone Edge, Earthquake, or Megahorn.</p>
<p>Venusaur is also threatened by fast Pokemon who can switch in on a resisted attack. Moltres is able to switch into a 4x resisted Leaf Storm and OHKO Venusaur with Fire Blast. Swellow can also switch in on Synthesis (and Sleep Powder if he is already statused) and quickly KO with Brave Bird or Facade. Azumarill and Regirock help Venusaur deal with both of these Pokemon; Azumarill can switch into Moltres and revenge kill him with Aqua Jet, while Regirock walls Swellow and sets up Stealth Rock to hinder Moltres. It can also check Moltres in a pinch.</p>