Hey Barb,
Pretty solid team you have here, but there are some things tht look pretty problematic. On first look things like Scarf terrakion and Scarf landorus look really annoying. Scarf terrakion can outspeed and seriously hurt every member of ur team, as sawsbuck reaches 510 speed and terrak has 519, and venu needs timid to outspeed him. Secondly, scarf landorus can spam earthquakes on ur team constantly(easier if opponent is smart with sand). And even if u have sun, you dont want to be switching sawsbuck or venu in and lowering ther survivability. The easiest solution would be to drop venusaur(assuming tht since sawsbuck is base of ur team u wouldnt want to drop him) for a Donphan. Donphan can solidly check scarf terrak, and scarf lando eqs(volcarona can use hp ices to setup). I would like to reccomend a 252 HP / 4 Atk / 252 Def @ impish w/ Rapid Spin/ Earthquake/ Ice shard/ Toxic. As you already have rocks on tran, I thought u could use toxic to catch jellicents/other spin blockers off guard. Rapid Spin also keeps rocks off the field, which can be really helpful if u decide to run an offensive volc set
Also as many other people have stated, sp def tran looks quite troublesome for ur team. The easiest solution to this, would be to change ur volcarona to an offensive HP Ground set. This set would work amazingly at luring in heatran and koing.
Anyways, hope i helped ^^