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Venusaur Lvl100 @Venasaurite
252 Speed EV
252 Sp.Atk EV
4 HP EV
31/31/31/31/31/31 IVs
Timid Nature
Ability:Chlorophyll/Mega: Thick Fat
-Solar Beam
-Sunny Day/(If you're setting up sun with something else)Whatever really.
-Synthesis
-Leech Seed
I used this and rekt everything because Venusaur is already pretty tank and adding Thick Fat with a viable sweep move and two viable healing options, one of which drains opponent slowly, counteracting Leftovers and the other works better in the weather you set up with.
Alternatively, to set up sun you could have Charizard Y as Special Sweeper/Sun Setter-Upper as a replacement for Groudon with M.Venusaur to counter those annyoing Water/Ice types (Cloyster I'm looking at you.). But with sun you also run the risk of being raped by impromptu Fire Types with a high Sp.ATK.
The point of that Venusaur though is to have a tank that can hit fast and hard.
And now kids, you know why Venusaur has been OU since 2007, even more so since XY.
EDIT:Also chlorophyll boosts it's speed so that's why I've reinforced it's speed stat and chosen Timid because it don't matter what it's ATK stat looks like.
In Gen VI, regular Venusaur isn't that good anymore for this reason: Drought now lasts for 5 turns (8 with Heat Rock), meaning that Venusaur can't effectively sweep under sun within a limited time span. Sunny Day may not be enough, given how easily it gets replaced by rain or sand, both very common weathers. Mega Venusaur should only stick to defensive spreads because it generally Mega Evolves ASAP, meaning there's little point in it keeping Chlorophyll:
-Giga Drain
-Sludge Bomb
-Leech Seed/Sleep Powder/Earthquake/Knock Off
-Synthesis
Nature: Bold/Relaxed
EVs: 252 HP/240 Def/16 Spe
Item: Venusaurite
or
-Giga Drain
-Sludge Bomb
-Hidden Power (Fire)
-Synthesis
Nature: Modest
EVs: 236 HP/252 SAtk/4 SDef/20 Spe
Item: Venusaurite