you actually have some decent individual pokes, for azum i'd run knock off over superpower cause your team isn't that ferro weak at all and knock off's utility is pretty amazing (it got a buff and dark is an amazing atk type)
so latios is a good defogger which is definitely a superior set to scarf (defog/draco/psyshock/hp fight or roost depending on how much you care about bisharp and tar pursuiting you, and you probably should), but if you run scarf i'd throw in trick over surf which isn't doing anything to tran and tar anyway. hp fire is really only good for ferro and mega scizor so i'd run hp fight (bisharp is really the worst) or thunderbolt cause mega gyarados is a champ though you won't be coming close to koing it. i'd run the defogger though, scarfers tend to be too weak in this meta and being locked into -2 draco or a weak coverage move isnt ideal
as for venusaur you definitely need synthesis since venu has a ton of utility on bulky teams for being able to check mmawile (sorta lol) azum non hp fly thund keld etc. while still providing something of an offensive presence. even if you run quake id run modest because mild is really counterintuitive on a mon like mvenu whereas sleep powder is more of a luxury. quake makes a decent tran lure hile hp fire is way better vs mawile scizors and ferro (and frankly stuff like balloon exca though giga hits that plenty hard really) but yeah, idr the ev spread for it but its something like 232 hp/252 satk/24 speed i think? i assume the speed is for mawiles and azums but i havent gone into the ev lab on venu so idr, but yeah invest in bulk for sure. you can also go
[email protected] hp/near max def (w/ same speed investment) because defensive mvenu w/ three atks is perfectly viable
the team as a whole is limited by toge a little bit but its not unusable so i'd play around on showdown and see what combos work with it, i sorta rushed this rate so i haven't given you much of a synergistic look but i guess you can find that our yourself but yeah good luck and serene grace is da wuurst :(