Crobat, specifically with Taunt (which all Crobat should run) is the best counter currently in the tier. Obviously Sleep Powder is annoying but it’s pretty rare and outside of that, I’m yet to see a Venusaur set properly threaten a Taunt Crobat.
The set I would suggest running is Brave Bird / Taunt / Roost / U-Turn or Super Fang, with max Attack and Speed and a Jolly nature. The best item for this is Flyinium Z, but if you have another Z user then Sky Plate or Black Sludge can work. I suppose if you are really looking for the perfect counter then you could run Safety Goggles, but this is useless when you’re not playing Amoonguss or Sleep Powder Venu.
The set I would suggest running is Brave Bird / Taunt / Roost / U-Turn or Super Fang, with max Attack and Speed and a Jolly nature. The best item for this is Flyinium Z, but if you have another Z user then Sky Plate or Black Sludge can work. I suppose if you are really looking for the perfect counter then you could run Safety Goggles, but this is useless when you’re not playing Amoonguss or Sleep Powder Venu.