as lbp said there is no point actually on using victrebeel, i feel like its just outclassed by Venusaur which has more bulk to setup a growth. However, i think your team would appreciate more the standard growth / Sludge bomb / Hidden power fire / Giga drain because your team needs a cleaner, the set lbp posted is better as an offensive supporter or something like that.
The other thing i think you can change is stone edge on Dugtrio. Dugtrio is too much setup fodder for a pletora of things, like Dragons (and stone edge fails to ko) Landorus-t, landorus, almost any ground resistor / flying pokemon / levitate, and this can be annoying. Memento is also usefull when you are in trouble, because you can sacrifice your dugtrio to take an hit with the sash and drop the attack of your opponent. its also great in a pinch if you need to setup with Venu/victrebeel since memento will let you have a free turn of setup.
Now, like any sun team, you rely on scizor too much to combat dragons i guess. Latwins spamming drago meteors or strong CB outrage can seriously dent your scizor, and you really want him to stay alive as much as possible, otherwhise you will be in troble with them. I also see some other specially based pokemon like Gengar, alakazam or reuniclus being a problem to switch in into, so i think you can try this set: Bullet punch / U-turn / Roost / Sword dance, with Metal coat as your item and a specially defensive spread consisting of EVs: 248 HP / 44 Atk / 216 SDef with an Adamant Nature. This helps you for a couple of reason, first you will have more switch in for the latwins and a more solid dragon resistor in general, as well as being a good switch in for the other things i mentioned, just watch out for hp fire since they can run it sometimes. This set gives you an another setup mon, which is great since you rely too much on venusaur in my opinion to close the battle, and a +2 bullet punch with metal coat is still powerfull enough to ko a lot of stuff, it still have your turning move so you dont lose your strategy.
If you dont want to change this set and you want to keep choice band, i think its worth a try a specially defensive spread for Cb zor anyway. I dont have the exact spread because i've never used it honestly, but i think you can find it on site if you are interested.
Other than that, great team and gl!