As mentioned, a spinner is needed. Hitmontop. and Torkoal are good choices. Also, Sawsbuck doesn't have the raw power to hit hard, so try this instead:
Weather counter
Tropius @ Lum/Sitrus
Harvest
252 atk 252 spd 4 hp
Nature (+Atk -Spatk)
-Dragon Dance
-Leaf Blade
-Chlorophyll/Earthquake
-Filler
When it successfully sets up, you'll be able to hit other weather just as hard out of weather. Leaf Blade can hurt DrizzleToad and Tyran/Hippo hard, and Earthquake for coverage. You might want to try Chlorophyll over Harvest, but it wouldn't work as well out of sun.