Venusaur
Overgrow: Honestly, this skill is pretty useless and there is no reason why you should run Overgrow over Chlorophyll.
Chlorophyll: So Venusaur got this Dream World Ability that many sun sweepers would die for. Double speed in the sun means that with certain investment, it can outrun a lot of Pokemon in the match. Growth gets 2 stage boost for attack and special attack in the sun, synthesis heals 2/3 of Venusaur's HP and of course, Solarbeam requires no charging.
Venu-Solar Beam
- Growth
- Solarbeam
- Synthesis/Giga Drain
- Hidden Power <Fire>
Ability: Chlorophyll
Nature: Modest (+sp.atk - atk)/Timid (+spd -atk)
Item: Life Orb
EV: 252 sp.atk/252 spd/4 def
Venusaur is crazy in the sun. Making full use of the Sun, Growth turns Venusaur into a fearsome and bulky sweeper. Solarbeam is the main meat of this set. At 120 Base Power with practically no drawbacks at all and after a growth boost and a life orb boost, it can really destroy an unprepared team. Giga Drain can be used on the third slot as a form of recovery, while doing damage. However, Synthesis heals a no doubt 2/3 in the sun, so it can be considered as well. Hidden Power <Fire> can turn into a 105 Base Power beast and help murder Ferrothorn, who can stop you dead in the tracks from going 6-0, as well as other steel types, who will try their best to wall you to the end.
I'm a Venusaur, tanking tanking tanking tanking tanking Venusaur
- Hidden Power <Fire>
- Synthesis/Giga Drain
- Toxic
- Leech Seed
Ability: Overgrow/Chlorophyll
Nature: Calm (+sp.def -atk) / Bold (+ def -atk)
Item: Black Sludge
EV: 252 HP/ 252 sp.def/ 4 def
Venusaur, under the sun, is fearsome defensively as well. Hidden Power <Fire> is a way to get you out of being taunted, destroy steel types who try to counter-tank you, as well as grass types who'll try to switch in to Leech Seed. Meanwhile, Synthesis and Giga Drain covers healing this tanker. Giga Drain has an edge for being able to prevent Venusaur from being a taunt bait, which may hurt its chances in tanking, and has an extra edge when weather gets cancelled. Toxic is your way of wearing down the opponent slowly, slowly poisoning them and let the poison cover their entire body before they slowly faint... Leech Seed gets there to help slowly recover you, and combined with Black Sludge, your enemy might have little chance of landing a fatal blow on this tanker.
Venusaur the Dinosaur
- Sword Dance
- Power Whip
- Earthquake
- Leech Seed/Synthesis
Ability: Chlorophyll
Nature: Adamant (+atk -sp.atk)
Item: Life Orb
EV: 252 atk/ 252 spd/ 4 sp.def
This set actually functions pretty well outside sun, but Venusaur still wants its sun. Sword Dance boosts two stage, everywhere. It is recommended over Growth as the side effect of boosting special attack is unnecessary in this set. Power Whip is strong, powerful but the 70 accuracy could hurt a bit. Earthquake is coverage for steel types like Heatran, who does not enjoy having his cave crumbling down like toy blocks. Of course, Leech Seed and Synthesis are there to recover from the Life Orb recoil, which might make you easier to take down.
Other Option
Sleep Powder is a decent option. However, a recovery move or a fire type move is too hard to ignore as it might cause some serious problems
Sunny Day can be run... If you don't have a Ninetales or Groundon on your side.
Partners
Ninetales and Groundon. That's all you really want, because Venusaur is back to UU without the sun. Thus, it is important that your team has the strength to fight back against common weather casters and weather cancellers like Golduck.
Countering Venusaur
To counter Venusaur, KILL SUN! Launch a rocket missle aimed at the sun and you - Oh never mind. To kill sun, either cancel weather effects or cancel it with another weather that is unfavourable to Venusaur, namely rain. Contestants like Kyogre, Politoed, Tyranitar, Hippowdon, Abomasnow, Golduck and Rayquaza comes into mind. Ironically, majority of the listed are weak to grass types. Abomasnow can kill Sun, throw in hail, hit it with a powerful 100% accurate Blizzard. In Sun, there are still contestants that can hit Venusaur hard.