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um you're awfully stealth rock weak and rock weak in general to be honest. Running a rapid spinner would really help on this team. Unfortunately, it seems that you're forced to give up Dugtrio since it is pretty much the only member of your team that can "take" a hit from most common rock attacks. Donphan is probably the best choice for this team since your only rock resist is dugtrio, and although it still traps Tyranitar I still think that this team will be too frail. You're also 6-0ed by opposing Volcarona that happen to pack hp rock. The most simple solution would be to just run roar on Heatran to help this problem, but there isn't really much use being picky beyond that. I think it would be cool to try and run a different set on Venu to try and support a sweep for Volcarona. Currently, Volc has no way of getting past Heatran, so I think that it would be a great idea if you ran earthquake / hp ice / solarbeam / growth or synthesis on Venusaur. This allows Venu to lure and in ko what is Volc's most common switch in (specially defensive Heatran). If you feel like you need to run sunny day on something, just run it on ninetales. This will allow you to sunny day against common Tyranitar variants or weaker versions of Politoed. gl!