Venusaur hit the jackpot in Generation V, as it received Chlorophyll from the Dream World, making it a dangerous offensive threat under the sun, even in Ubers. Growth also provides a +2 boost to both Attack and Special Attack in the sun, which means Venusaur's offensive stats will both skyrocket to over 500 with just one use of Growth. With Groudon reliably providing everlasting sun, all Venusaur needs is one turn of setup to wreak havoc with its boosted attacks. Access to Sleep Powder sets Venusaur apart from other Chlorophyll users such as Shiftry, making it much easier for Venusaur to set up. Venusaur's Poison typing also allows it to absorb Toxic Spikes, letting it support the rest of its team while also maintaining a strong offensive presence. Unfortunately, it isn't all sunshine and happiness for our giant plant monster; weather changers that can instantly remove Venusaur's valuable sunlight are prominent in Ubers. Moreover, Venusaur's offensive stats are simply not good enough for it to significantly damage titanic walls such as Lugia, Ho-Oh, and Giratina. Its STAB attacks are also resisted by Dragon- and Steel-type Pokemon—two of the most common types in the tier, most of which can sponge even boosted hits. Despite these flaws, Venusaur is not to be underestimated; with the proper support, it can mow through entire teams with ease.
With Growth and Chlorophyll doubling its Special Attack and Speed, respectively, this set utilizes the sun to its full capacity. After one Growth, Venusaur reaches 656 Special Attack, allowing it to strike on the opponent's team for high damage. Sleep Powder makes Venusaur a frightening setup sweeper, as not only does it shut down its counters by putting them to sleep, but it also grants Venusaur an easier time setting up. Venusaur's main attack and STAB in Grass Knot hits very hard due to the vast amount of heavy Pokemon in the Ubers metagame. In fact, after a Growth, Venusaur can OHKO max HP Normal Arceus that has taken Stealth Rock damage. Sludge Bomb provides great overall coverage and a secondary STAB, OHKOing Manaphy and Rayquaza after a Growth, whereas Hidden Power Fire snipes the Steel-types that usually counter Venusaur, such as Ferrothorn, Forretress, and Skarmory.Team Options & Additional Comments >>>
Venusaur can run a mixed set very well; Growth doubles both its Attack and Special Attack under sun, enabling it to hit hard with a greater selection of moves. After a Growth, Venusaur's Attack and Special Attack jump to a sky-high 446 and 598 respectively with the given EVs. STAB Grass Knot and Sludge Bomb give it coverage on many common threats in Ubers, and are Venusaur's most powerful attacks. After a Growth, Grass Knot OHKOes Groudon and Kyogre with ease, whereas Sludge Bomb maims the Dragon-types that resist Grass Knot, as well as OHKOing Shaymin-S. Earthquake offers excellent neutral coverage along with Venusaur's other moves, smacking the Steel-types that resist Venusaur's Grass STAB and are immune to its Poison STAB, such as Dialga. Sleep Powder can be used over Sludge Bomb for an easier setup, but Venusaur will miss out on a significant degree of coverage.Team Options & Additional Comments >>>
With a powerful STAB of Seed Bomb, Earthquake to hit grounded Steel-types that sponge its STAB, and Sleep Powder to incapacitate the opponent and nab it a free turn of setup, Venusaur makes a fantastic Swords Dance user. Sleep Powder sets Venusaur apart from the other run-of-the-mill Chlorophyll users, and becomes massively useful with BW's sleep mechanics: Venusaur can come in, put the opponent to sleep, and set up Swords Dance with impunity. Seed Bomb is Venusaur's most powerful STAB attack, decimating anything that doesn't resist it. After a Swords Dance, Seed Bomb OHKOes Kyogre and all but the most defensive variants of Groudon. Earthquake complements Seed Bomb nicely, as it hits the Dragon- and Steel-types that resist the former move very hard; specifically, it 2HKOes Dialga and Steel Arceus after the boost.Team Options & Additional Comments >>>
Sadly, Venusaur does not have many other options. A set featuring Substitute, Sleep Powder and Leech Seed can be used, utilizing Venusaur's Speed in sun, but Venusaur is just not bulky enough to utilize it. There are other Hidden Power types that can be used on the Special Growth set: Hidden Power Rock can be used to OHKO Ho-Oh at +2, and Hidden Power Ground can be used to hit Dialga, but the coverage they provide is very shallow. Moreover, if you want Venusaur to be able to get past Dialga, it's better to use the Mixed Growth set. Energy Ball can be used to hit the lighter Uber Pokemon, such as Manaphy, but Sludge Bomb hits hard enough, and in Manaphy's case, it OHKOs at +2. Outrage, Giga Drain, Leaf Storm, and Power Whip are unfortunately illegal with Chlorophyll.
Checks and Counters
Sleep Powder allows Venusaur to set up on its counters, thus making it very hard to defeat. However, it is very inaccurate, making it a somewhat unreliable method to get past counters. Extremely fast Choice Scarf users, such as Mewtwo, Darkrai, and Shaymin-S, outspeed Venusaur even after the Chlorophyll boost and strike very hard with their STAB moves. Strong priority moves, such as Extreme Killer Arceus's ExtremeSpeed or Scizor's Bullet Punch, wear down Venusaur easily, whereas Thundurus's Prankster Thunder Wave hinders Venusaur, as even in the sun Venusaur's Speed will be a half of its original Speed.
The Giratina formes completely shut down Venusaur, as they resist both of its STABs and are extremely bulky. Moreover, both can phaze Venusaur with their STAB Dragon Tail, whereas Giratina-O, who is also immune to Earthquake, can easily OHKO with a Draco Meteor. Choice Scarf Kyogre changes the weather, outspeeding Venusaur as Chlorophyll is canceled, and OHKOes with a super effective Ice Beam. Rayquaza is faster due to Air Lock which cancels the effects of the weather, and OHKOes with Fire Blast, V-create, Outrage, or Draco Meteor. Ho-Oh and Lugia resist Venusaur's Grass STAB and can tank a boosted Sludge Bomb due to their extremely high base 154 Special Defense, though the former needs Stealth Rock off the field to counter Venusaur reliably. Latias needs Psyshock or a few Calm Mind boosts under her belt in order to counter Venusaur, as Venusaur strips off 57.69% minimum with a +2 Sludge Bomb, and Dragon Pulse is not wielding an OHKO.
The Special set is fairly hard to stop, as Grass Knot hits extremely hard, and Sludge Bomb provides great neutral coverage. Heatran and Dialga are not only immune to Sludge Bomb and quadruple-resist Grass Knot, but they are also able to put a stop to Venusaur's sweep with their STAB moves. Chansey and Blissey can tank even a +6 Sludge Bomb, which does 50.62% - 59.81% to the former and 62.26% - 73.31% to the latter, and procceed to stall Venusaur with Softboiled, Wish, and Seismic Toss. If they have been put to sleep by Sleep Powder, Natural Cure awakens them as they switch. If Hidden Power Fire is used over Sludge Bomb, Dragon-types such as Salamence will wall this set, as they can easily OHKO Venusaur with a Fire Blast. If Hidden Power Ice is used, Steel-types can tank Venusaur's hits with ease.
The Swords Dance set is easier to stop, though you must be wary of Sleep Powder, as you do not want your counter to fall asleep. Skarmory, Bronzong, and Scizor put a full stop to it due to their Steel-typing, and can hit back with their STAB moves. Ferrothorn and Forretress can only beat this set if they carry Gyro Ball or Thunder Wave, respectively. Grass, Bug, and Flying Arceus resist Seed Bomb and Earthquake (Flying Arceus is immune), can Recover the damage, burn Venusaur with Will-O-Wisp, or put an end to its sweep by using Flying Judgment or Ice Beam. Tornadus and Shaymin-S also fall in the same boat as Flying Arceus, easily OHKOing Venusaur with their Flying STAB moves.
Tyranitar deserves a mention for changing to weather to sandstorm, but aside from that, it can do nothing. +1 Grass Knot in sandstorm does 83.16 - 98.01% to max HP and Special Defense Tyranitar, landing an OHKO after Stealth Rock damage, while Fire Blast will not OHKO Venusaur. If Earthquake is not present in Venusaur's moves, Dialga stops it cold. The rare Metagross can take anything bar a +2 sun-boosted Hidden Power Fire, and can strike very hard with its STAB Meteor Mash or Zen Headbutt. The former will OHKO Venusaur if Choice Band is used as the item, whereas Zen Headbutt will always OHKO. Hitting fast is recommended, as once Venusaur sets up a Growth or a Swords Dance, it will hit extremely hard.