In Gens 1, 2 & 3, it says Victreebel is OU. While G1 is believable, I'm pretty sure it doesn't have the usage to possibly be OU in Gens 2 & 3. Is it some glitch on the website?
https://www.smogon.com/dex/rs/pokemon/victreebel/
https://www.smogon.com/dex/gs/pokemon/victreebel/
https://www.smogon.com/dex/rb/pokemon/victreebel/
https://www.smogon.com/dex/rs/pokemon/victreebel/
https://www.smogon.com/dex/gs/pokemon/victreebel/
https://www.smogon.com/dex/rb/pokemon/victreebel/