I didn't know why Venusaur never had a dedicated SubSeeder set, so I decided to write one up. SubSeeder Venusaur is one of my VIPs on my paralysis-oriented team, and it works like a charm. It's very bulky and has the perfect typing to use Leech Seed effectively (hitting Grass-types with STAB Sludge Bomb).
http://www.smogon.com/dp/pokemon/venusaur
[SET]
name: SubSeeder
move 1: Substitute
move 2: Leech Seed
move 3: Sludge Bomb
move 4: Sleep Powder / Body Slam
item: Leftovers
nature: Calm
evs: 252 HP / 128 Def / 128 SpD
[SET COMMENTS]
<p>Venusaur has all of the qualities to abuse the SubSeed combination effectively. With its great overall defenses and helpful supporting movepool, it's quite difficult to stop Venusaur once it sets up. The main advantage Venusaur has over other SubSeeders, such as Tangrowth and Sceptile, is the fact that it possesses the Poison typing, which allows it to destroy nearly any Grass-type that tries to absorb Leech Seed with a STAB super effective Sludge Bomb.</p>
<p>Sleep Powder and Body Slam both have their merits. Sleep Powder incapacitates the opposing Pokemon for a few turns, giving Venusaur the perfect chance to set up its SubSeeding chain. On the other hand, Body Slam has a chance of paralyzing the target and helps Venusaur move first. Venusaur can then effectively stall the opponent by Leech Seeding it and repeatedly using Substitute.</p>
[ADDITIONAL COMMENTS]
<p>The EV spread focuses on maximizing Venusaur's defensive capabilities on both sides of the spectrum. With 128 Defense EVs, Venusaur's Substitute will almost never be broken by 100 Attack Careful Registeel's Iron Head, making Registeel perfect set-up bait. A Calm nature and 128 Special Defense EVs allow Venusaur to never be 5HKOed by 0 Special Attack Bold Milotic's Ice Beam and never be 2HKOed by 220 Special Attack Life Orb Modest Milotic's Ice Beam. The Milotic calculations are assuming that you have Leech Seeded them.</p>
<p>Paralysis support is probably what Venusaur would benefit from the most support-wise, especially if you are using Sleep Powder instead of Body Slam, as Venusaur no longer has to worry about spreading paralysis itself. Before you start spreading paralysis, however, allow Venusaur to put one of the opponent's Pokemon to sleep, since if you paralyze almost every Pokemon on your opponent's team, Venusaur will have trouble using Sleep Powder successfully. If you are able to spread paralysis throughout the opponent's team, Venusaur will be more effective when Leech Seed stalling. Slowbro is an excellent user of Thunder Wave and also has fantastic type synergy with Venusaur. Substitute-using threats that resist Sludge Bomb, such as Mismagius and Toxicroak, can easily cause problems as well. It's best to use Pokemon that can deal with the aforementioned threats, such as Spiritomb and Uxie, respectively, or you may have a hard time using Venusaur effectively. Moltres, although not resistant to Sludge Bomb, can easily stall out Venusaur's Sludge Bomb by alternating between Substitute and Roost, so it needs to be dealt with too. RestTalk Milotic, who also has great synergy with Venusaur, is a decent option for combating SubRoost Moltres, eliminating it with Surf.</p>
http://www.smogon.com/dp/pokemon/venusaur
[SET]
name: SubSeeder
move 1: Substitute
move 2: Leech Seed
move 3: Sludge Bomb
move 4: Sleep Powder / Body Slam
item: Leftovers
nature: Calm
evs: 252 HP / 128 Def / 128 SpD
[SET COMMENTS]
<p>Venusaur has all of the qualities to abuse the SubSeed combination effectively. With its great overall defenses and helpful supporting movepool, it's quite difficult to stop Venusaur once it sets up. The main advantage Venusaur has over other SubSeeders, such as Tangrowth and Sceptile, is the fact that it possesses the Poison typing, which allows it to destroy nearly any Grass-type that tries to absorb Leech Seed with a STAB super effective Sludge Bomb.</p>
<p>Sleep Powder and Body Slam both have their merits. Sleep Powder incapacitates the opposing Pokemon for a few turns, giving Venusaur the perfect chance to set up its SubSeeding chain. On the other hand, Body Slam has a chance of paralyzing the target and helps Venusaur move first. Venusaur can then effectively stall the opponent by Leech Seeding it and repeatedly using Substitute.</p>
[ADDITIONAL COMMENTS]
<p>The EV spread focuses on maximizing Venusaur's defensive capabilities on both sides of the spectrum. With 128 Defense EVs, Venusaur's Substitute will almost never be broken by 100 Attack Careful Registeel's Iron Head, making Registeel perfect set-up bait. A Calm nature and 128 Special Defense EVs allow Venusaur to never be 5HKOed by 0 Special Attack Bold Milotic's Ice Beam and never be 2HKOed by 220 Special Attack Life Orb Modest Milotic's Ice Beam. The Milotic calculations are assuming that you have Leech Seeded them.</p>
<p>Paralysis support is probably what Venusaur would benefit from the most support-wise, especially if you are using Sleep Powder instead of Body Slam, as Venusaur no longer has to worry about spreading paralysis itself. Before you start spreading paralysis, however, allow Venusaur to put one of the opponent's Pokemon to sleep, since if you paralyze almost every Pokemon on your opponent's team, Venusaur will have trouble using Sleep Powder successfully. If you are able to spread paralysis throughout the opponent's team, Venusaur will be more effective when Leech Seed stalling. Slowbro is an excellent user of Thunder Wave and also has fantastic type synergy with Venusaur. Substitute-using threats that resist Sludge Bomb, such as Mismagius and Toxicroak, can easily cause problems as well. It's best to use Pokemon that can deal with the aforementioned threats, such as Spiritomb and Uxie, respectively, or you may have a hard time using Venusaur effectively. Moltres, although not resistant to Sludge Bomb, can easily stall out Venusaur's Sludge Bomb by alternating between Substitute and Roost, so it needs to be dealt with too. RestTalk Milotic, who also has great synergy with Venusaur, is a decent option for combating SubRoost Moltres, eliminating it with Surf.</p>
