Major appearances
Bellsprout appeared in The Fourth Round Rumble, where it played a major role as Jeanette Fisher's Pokémon. It was used in her battle against Ash. This Bellsprout was unusually strong and managed to defeat Bulbasaur and Pikachu, but lost to Muk. It reappeared in a flashback in the following episode and Bulbasaur... the Ambassador!.
A Bellsprout appeared in A Bout With Sprout. A boy called Zackie from Earl Dervish's Pokémon academy wanted to have Ash's Pikachu very badly, but in his efforts to catch it, he caught Bellsprout instead. This Bellsprout later saved the day when Team Rocket was causing trouble at the Sprout Tower.
A Bellsprout nicknamed "Spoopy" appeared in A Better Pill to Swallow as Old Man Shuckle's Pokémon. It was able to run very fast and it could lift boulders.
A very old Bellsprout appeared in PK13. It is the elder of the Summer Festival, and was the one who told Pikachu and the others about an Aggron living on a deserted island, where Skarmory took Azumarill.
A Bellsprout appeared in Who, What, When, Where, Wynaut?, under the ownership of Roderick. It was used in an unsuccessful attempt to save May and Drew from falling off a cliff.
A Bellsprout appeared in Defending the Homeland!, under the ownership of Keanan. It reappeared in Master Class is in Session!, Performing a Pathway to the Future!, A Diamond in the Rough!, Valuable Experience for All!, and Facing the Needs of the Many!. Keanan's Bellsprout is a good friend of Ash's Goodra, which was shown when it instantly identified it despite it having evolved from Goomy.
Minor appearances
Bellsprout debuted in Primeape Goes Bananas.
A Bellsprout appeared in Pokémon Scent-sation! as one of the Pokémon in Celadon Gym.
A Bellsprout appeared in Pokémon Fashion Flash as one of the Pokémon seen on Scissor Street.
A Bellsprout appeared in Sparks Fly for Magnemite, where it was seen in Gringey City's Pokémon Center.
A Bellsprout appeared in The Kangaskhan Kid, The March of the Exeggutor Squad, The Breeding Center Secret, and Pallet Party Panic.
A Bellsprout appeared in Mewtwo Strikes Back.
Multiple pink Bellsprout resided on the Pinkan Island in In the Pink.
A Bellsprout appeared in The Power of One.
A Bellsprout was part of an exhibition in Flower Power.
A Bellsprout belonging to the Nursing School appeared in a flashback in Ignorance is Blissey.
Multiple Bellsprout appeared in Foul Weather Friends.
A Bellsprout appeared in Tricks of the Trade as one of the Pokémon seen at the Pokémon Swap Meet in Palmpona.
A Bellsprout appeared in Carrying On! as one of the sick Pokémon in Way Away Island's Pokémon Center.
A Bellsprout appeared in Beauty and the Breeder, where it participated in a Pokémon breeding competition.
Four Bellsprout appeared in The Grass Route, with two being wild and two belonging to different Trainers participating in the Grass Tournament.
A Bellsprout appeared in Celebi: The Voice of the Forest.
A Bellsprout was one of the inhabitants of an oasis just for Pokémon in Got Miltank?.
Two Bellsprout were among the Pokémon seen at Wings Alexander's barn in Throwing in the Noctowl.
A Bellsprout appeared in The Legend of Thunder!.
A Bellsprout was one of the inhabitants of the Dragon Holy Land in Fangs for Nothin'.
A Bellsprout was seen being fed by Tracey at Professor Oak's Laboratory in Johto Photo Finish.
A Bellsprout appeared in Gonna Rule The School!, where it was one of the Pokémon inside Anthony's Azumarill mouth.
A Bellsprout was used by one of the students of the Pokémon Trainers' School in Gonna Rule The School!.
A Bellsprout appeared in The Ribbon Cup Caper at the S.S. St. Flower's Pokémon Center.
A Bellsprout appeared in the opening sequence of Lucario and the Mystery of Mew.
A Coordinator's Bellsprout appeared in The Saffron Con as one of the Pokémon that were taken by Team Rocket.
A Bellsprout appeared in From Cradle to Save, under the ownership of a student at the Pokémon Ninja School.
A Trainer's Bellsprout appeared in Off the Unbeaten Path, where it was seen participating in the Pokémon Orienteering competition.
A Bellsprout appeared in The Unbeatable Lightness of Seeing! as one of the Pokémon at Fennel Valley.
A Bellsprout appeared in Pokémon Mystery Dungeon: Team Go-Getters Out of the Gate!.
A Bellsprout briefly appeared in The Rise of Darkrai as one of the Pokémon Darkrai hit with a Dark Void.
Two Bellsprout appeared in Pokémon Ranger and the Kidnapped Riolu! (Part 1). Four additional Bellsprout appeared in the follow-up episode.
A Bellsprout made a cameo in Arceus and the Jewel of Life.
A Bellsprout appeared in Promoting Healthy Tangrowth!. It was among the group of Pokémon that was trying to restore the life of a dying tree.
A Bellsprout appeared in Zoroark: Master of Illusions as one of the many local Pokémon living in Crown City. It worked together with several other Pokémon in surrounding Zorua at the park to attack him, angry for what Zoroark did to the city. Before a fight broke out, Bellsprout, along with the other Pokémon, were calmed down by Celebi.
A Trainer's Bellsprout appeared in Thawing an Icy Panic! and Under the Pledging Tree!.
A Bellsprout appeared in Pikachu and the Pokémon Music Squad. It was among the Pokémon residing in a forest.
A Bellsprout appeared at Professor Oak's Laboratory in I Choose You!. It and an Oddish were watered by Professor Oak using a Squirt Bottle.
Multiple wild Bellsprout appeared in Alola, Kanto!.
A Trainer's Bellsprout appeared in The Power of Us.
In the Pokémon Adventures manga
Bellsprout makes a cameo in ...But Fearow Itself! when Red remembers capturing one.
Bellsprout appeared as a silhouette when Green explains about Mew in The Jynx Jinx.
Later, in Meanwhile...Vileplume! Erika of the Celadon Gym is seen in possession of a Bellsprout, who, despite its small size, was able to daze the fully-evolved Poli by mimicking its Double Slap. Later, during the Yellow arc, it was revealed to have fully evolved.
In A Hollow Victreebel a hidden colony of Bellsprout line members in the Safari Zone captured Red for their evolution ritual. With the help of Pidgebot 1 that was assigned to him, and a few good items he carried around, the Bellsprout that were about to eat him for their evolution were distracted, and he was able to flee. By morning Red had captured multiple Safari Zone Pokémon including several Bellsprout.
A sextet of Bellsprout is seen in Bellsprout Rout during Gold's visit to Sprout Tower. Gold is attacked by the monks and their Bellsprout in an attempt to convince him to join their group. The excellent teamwork of the Bellsprout manages to make short work of Gold's Aipom, only to lose to Gold's Cyndaquil when it incinerates them from below. A picture and two statues of Bellsprout appeared by the side of the Sprout Tower in Bellsprout Rout.
In The Last Battle XIII a Bellsprout was one of the Pokémon sent to help the fight in Ilex Forest.
In Out-Odding Oddish, a Bellsprout appeared in the Pokéathlon.
In the Pokémon Gotta Catch 'Em All manga
Shū has two Bellsprout in the Pokémon Gotta Catch 'Em All manga. He caught the first in a Pokémon-catching competition in Pokémon Get Match!!. He then caught the second one in Plague on the Bellsprout.