Major appearances
Parasect debuted in The Problem with Paras, under the ownership of Cassandra. It was initially a very weak Paras. Cassandra needed it to evolve into a Parasect so she can use the giant mushroom to aid in her medical research. After it battled with Ash's Pokémon (albeit, all of them except his disobedient Charmeleon not trying at all), and a battle with Team Rocket, Paras evolved.
A Parasect appeared in Hocus Pokémon. Lily needed Stun Spore from the Mushroom Pokémon to complete a spell.
Officer Jenny uses a Parasect in Gulpin it Down. Parasect was used in addition to her Meganium and Tangela, to try to stop the massive army of Gulpin that was rioting around the town.
Minor appearances
A Parasect appeared in A Chansey Operation, where it was one of the injured Pokémon brought to the clinic.
A Parasect appeared in Princess vs. Princess, where it was competing in the Queen of the Princess Festival contest.
A Parasect appeared in Pikachu's Vacation as one of the Pokémon seen at the Pokémon Theme Park.
Multiple Parasect were among the Pokémon seen at Professor Oak's Laboratory in Showdown at the Po-ké Corral.
A Trainer's Parasect appeared in Friends to the End during the closing ceremonies of the Indigo Plateau Conference.
A Parasect appeared in The Power of One.
A wild Parasect appeared in Pikachu's Rescue Adventure.
A Parasect appeared in a fantasy in The Rivalry Revival.
Multiple Parasect appeared in Celebi: The Voice of the Forest.
A Parasect appeared in Throwing in the Noctowl as one of the Pokémon seen living at Wings Alexander's barn.
Multiple Parasect appeared in For Ho-Oh the Bells Toll!, where they protected the Tin Tower after Team Rocket stole the Crystal Bells on the top floor.
A Parasect was one of the Pokémon seen at Professor Oak's Laboratory in Showdown at the Oak Corral.
Multiple Parasect appeared in Destiny Deoxys.
A Parasect appeared in the opening sequence of Lucario and the Mystery of Mew.
In the beginning of Pokémon Ranger and the Temple of the Sea, The Phantom used a Parasect alongside Pinsir to attack Jack Walker.
A Parasect appeared in The Keystone Pops!.
A Parasect appeared in Genesect and the Legend Awakened at Pokémon Hills.
A Trainer's Parasect appeared in Alola to New Adventure! and First Catch in Alola, Ketchum-Style!.
A Parasect appeared in Lillie's Egg-xhilarating Challenge!, where it was among the Pokémon playing in Lillie's garden.
A Trainer's Parasect appeared in I Choose You!.
A Parasect appeared in Currying Favor and Flavor!, where it used Stun Spore on Ash and Mallow as they searched for a Mago Berry.
Six Parasect appeared in The Power of Us, with four under the ownership of Trainers and the other two being wild.
Three Parasect appeared in SM090, with two under the ownership of different Trainers and the third being wild. They joined the rest of Alola in showering Necrozma with light so it could return to its true form.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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EP044
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Parasect
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Ash's Pokédex
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Parasect, the Mushroom Pokémon. It battles using poison spheres that spread from the mushroom canopy on its back.
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In the Pokémon Adventures manga
Parasect debuts in Long Live the Nidoking! where it is seen as one of the Pokémon at Fuchsia City's Safari Zone and in the next round A Hollow Victreebel where multiple Parasect were captured by red off-screen.
In the Gold, Silver & Crystal arc of Pokémon Adventures, Crystal uses a Parasect nicknamed Parasee which it first appeared in Slugging It Out With Slugma, extensively in her Pokémon capturing, using its Spore attack to put targets to sleep. Her Parasect is seen to be capable of increasing the radius of its Spore attack to at least 3 kilometers. In Lively Larvitar, the origin of Crystal's Parasect is revealed: it, along with Crystal's Natu, Hitmonchan, and Cubone, were wild Pokémon living in Mt. Mortar and had fought with a local Arcanine that had gone berserk from a severe eye injury. Parasect was able to create medicinal spores to help Arcanine heal and Crystal recover from her fractured arms. In Lugia and Ho-Oh on the Loose (Part 1), Crystal reveals yet another ability of Parasect: it is able to use the powder attacks it possesses to combine into a wider range of spores, including one for corroding metals.
Another Parasect appeared in The Last Battle XIII as one of the Pokémon sent to help the fight in Ilex Forest.
A Parasect belonging to an Aether Foundation Employee first appeared in the Sun & Moon arc.
In the Pokémon Pocket Monsters manga
Green's Parasect debuted in The Big Battle In The Viridian Forest!!.