Victreebel is a plant Pokémon with a bell-shaped body. It has a gaping mouth with pink lips and two sharp teeth. Its semicircular eyes appear directly under its mouth and it has several dark green spots on its body. On either side of its body is a large green leaf. Covering Victreebel's mouth is a leaf with a long, brown, yellow-tipped vine growing out of it. The vine is flicked to mimic an animal in order to attract prey. Victreebel also produces a sweet scent to further aid in luring its victims. Acid that has dissolved numerous prey animals becomes sweeter and even more effective at attracting prey.
It can be found in small groups and is territorial. In the manga, Victreebel hoards food, usually small birds and rodents, and collects Leaf Stones to perform evolution rituals at night to help Weepinbell become more Victreebel. Being the result of an evolution via evolutionary stone, Victreebel is rarely found in the wild, though they can be found in temperate forests and jungles.
In the main series
Major appearances
James had two separate Victreebel (traded for each other in Here's Lookin' at You, Elekid), both of which evolved from Weepinbell while in his possession. His second Victreebel was expelled from the group by Jessie after it attacked her. It landed near James's first Victreebel, both Pokémon fell instantly in love, and they hopped off together into the forest. They have not been seen since.
Other
A Victreebel appeared in Danger, Sweet as Honey! as a resident of Honey Island. Axew stumbled upon it and had a look inside its mouth. Knowing how dangerous it was, Pikachu and Meowth tried to drag him away, but Victreebel woke up and bit Meowth instead. Pikachu and Axew managed to pull Meowth out, but Meowth was poisoned in the process.
Multiple Victreebel appeared in Thawing an Icy Panic!, under the ownership of Ramos. They attacked Clemont when he accidentally broke the fence of Ramos's ranch, but they were stopped through the intervention of Ramos himself.
Minor appearances
Victreebel debuted in Pokémon Scent-sation! as one of the Pokémon in the Celadon Gym.
A Victreebel appeared in The Kangaskhan Kid.
A Victreebel appeared in The Battling Eevee Brothers during the evolution party in Stone Town.
A Victreebel appeared in Pikachu's Vacation as one of the Pokémon seen at the Pokémon Theme Park.
Multiple Victreebel appeared in The Power of One.
Multiple wild Victreebel appeared in Pikachu's Rescue Adventure.
A Victreebel appeared in the opening intro of Celebi: The Voice of the Forest, which was reused for Pokémon Heroes: Latios & Latias.
Multiple Victreebel made brief cameo appearances in Destiny Deoxys.
A Victreebel appeared in the opening of Lucario and the Mystery of Mew.
Multiple Victreebel made brief cameo appearances in Giratina and the Sky Warrior.
A Victreebel appeared in the opening sequence of Arceus and the Jewel of Life, where it was seen in an Aroma Lady's field of flowers.
A Trainer's Victreebel appeared in Under the Pledging Tree!, where it was among the Pokémon present during the Coumarine City Festival.
A Victreebel appeared in Alola, Kanto!, where it and a Weepinbell got into a fight with some Gloom and a Vileplume, which Bulbasaur had to break up.
In Pokémon Origins
Red's Victreebel appeared in File 3: Giovanni. It went up against Giovanni's Rhyhorn and lost in one hit.
In the Ash & Pikachu manga
A Victreebel appeared in a flashback in Tale Of The Friendship Between Pikachu And Meowth.
In the Magical Pokémon Journey manga
A Victreebel appeared in How Do You Do, Pikachu?.
In the Pocket Monsters Diamond & Pearl manga
A Victreebel appeared in PDP01.
In the Pokémon Adventures manga
In Long Live the Nidoking!, Red was caught by a wild Victreebel in the Safari Zone. In the next round, A Hollow Victreebel, he was to be used as food in an evolutionary ritual for several Bellsprout and Weepinbell. He used a Poké Flute and a Poké Doll to disrupt the ritual and escape. In the process, he captured a Victreebel, which he used to battle the Nidoking that was after him. By morning, Red had caught several Safari Zone Pokémon, including multiple Victreebel.
Erika has a Victreebel, which first appeared as a Bellsprout during her battle with Red in Meanvile Vileplume!. It evolved into a Victreebel prior to Whacked by Marowak!.
In Three Cheers for Chikorita, Crystal manages to catch a Victreebel in her quest to fill the Pokédex. During the fight, Professor Elm's Chikorita comes looking for Crystal, prompting Victreebel to sneakily use Chikorita as a living shield to defend itself from Arcanine's Fire-type attacks.
A Victreebel appeared in The Last Battle XIII as one of the Pokémon sent to participate in the fight in Ilex Forest.
Origin
Bulbanews has an article related to this subject:
Victreebel and its pre-evolved forms are based on carnivorous pitcher plants.
Name origin
Victreebel seems to be a combination of victory (corrupted to make a pun on tree) and bell (referring to its bell-like shape). The maximum number of characters possible to make up a Pokémon's name in Generation I was ten, and this is likely the reason for the misspelling of bell as bel.
Utsubot is derived from 靫葛 utsubokazura (pitcher plant). It may also be based on 壷 tsubo (jar) or ポット pot (relative to bot), referring to its shape. It could also draw from botanical.