オニオン Onion
"The silent boy of mystery!"
Sword Shield Allister.png
Artwork from Sword and Shield by take[1]
Gender Male
Eye color Purple
Hair color Black
Hometown Stow-on-Side
Region Galar
Trainer class Gym Leader
Generation VIII
Games Shield, Masters EX
Leader of Stow-on-Side Stadium
Badge Ghost Badge
Specializes in Ghost types
Game animation debut Letter
English voice actor Casey Mongillo (Pokémon: Twilight Wings)
Nicole Gose[2] (Masters EX)
Japanese voice actor Ryō Hirohashi[3] (Pokémon: Twilight Wings, Masters EX)
Anime debut The Spectral Express!
English voice actor Ryan Bartley
Japanese voice actor Chiyuki Miura

Allister (Japanese: オニオン Onion) is the Gym Leader of Stow-on-Side's Gym, known officially as Stow-on-Side Stadium. He specializes in Ghost-type Pokémon. He gives the Ghost Badge to Trainers who defeat him. In Pokémon Sword, Bea takes his place as Stow-on-Side's Gym Leader instead.

In the core series games

  This section is incomplete.
Please feel free to edit this section to add missing information and complete it.

Allister is the fourth Gym Leader Galar Trainers face in their Gym Challenge in Pokémon Shield. This mysterious Trainer became the Gym Leader of Stow-on-Side Gym at a very young age. He is known to be very shy and fearful around people which is why he wears a mask. The mask serves as a way of confronting his fears and insecurities. He never removes his mask in public. He also keeps about 100 masks with the same design needed in the event his mask falls off. He is rarely seen around in public, preferring to spend most this time alone in ruins and cemeteries.[4] According to Allister, he claims to have the ability to see deceased Ghost-type Pokémon after a supposed accident at the age of four.

After Allister's initial defeat, the player is awarded with the Ghost Badge, TM77 (Hex), and the Ghost Uniform.

League Cards

This is a transcript of the back of Allister's League Cards in Pokémon Shield.

Normal League Card
"He is a young, mysterious Trainer who has taken on the mantle of Gym Leader at a very young age. He has never been known to remove his mask in public. In fact, he has at least one hundred masks of the same design, just to keep spares handy should his mask fall off for some reason. He claims to have developed the ability to see deceased Ghost-type Pokémon after an accident he had when he was four years old, but the truth is still a mystery."
Rare League Card
"This is a photo that happened to capture Allister in his locker room. He can be seen clutching the mask that normally hides his face, no doubt confronting the fears and insecurities he feels within. Even though he has taken the role of Gym Leader at a very young age, it is clear that off the pitch he is still very much a normal boy. However, one mystery remains—nobody knows who took this photo. Some even claim it was the work of Ghost-type Pokémon."


Allister keeps his Pokémon in Dusk Balls.

Pokémon Shield

Stow-on-Side Stadium

Champion Cup

Champion tournaments

Galarian Star Tournament

In the spin-off games

Pokémon Masters EX

Main article: Allister (Masters)


Concept art from Sword and Shield Artwork of Allister
from Pokémon: Twilight Wings
Artwork of Allister
from Pokémon Journeys: The Series
Artwork of Allister
from Pokémon Journeys: The Series


Icon from the
Galarian Star Tournament menu

League Cards

Allister's League Card in
Allister's rare League Card in


Main article: Allister/Quotes

In the anime

Main series

Allister in the anime

Allister debuted in The Spectral Express!. While traveling through Wyndon Station, Allister accidentally bumped into Ash and dropped his train ticket. Hoping to return the dropped item, Ash and Goh followed Allister and found themselves boarding a ghost train. By the time the three reunited, Ash had been possessed by the lone spirit of a Spiritomb boarding the train. While Goh kept the main Spiritomb body busy, Allister helped remove the spirit from Ash's body. Ash's Gengar then returned the spirit back to Spiritomb, calming it down. Upon the train reaching Stow-on-Side, Allister disappeared.

Allister reappeared in The Winding Path to Greatness!, where Ash and Goh learned that he was one of Stow-on-Side's Gym Leaders, although his Gym was much smaller than the Stow-on-Side Stadium. Ash came to him to ask help in Gigantamaxing his Gengar, which he agreed to. However, when it turned out Gengar could only perform a standard Dynamax, Allister told Ash and Goh about Max Mushrooms and the Max Soup that can made from them and can make a Pokémon capable of Gigantamaxing. Allister accompanied Ash and Goh to the forest where Max Mushrooms grow, warning them of the Ghost-type Pokémon lurking in the woods. Once they had collected a sufficient amount of Max Mushrooms, Allister started cooking them and stayed awake overnight to watch over the stew pot. During the night, Allister had a talk with Gengar, understanding its desire to become stronger and its happiness of being with Ash. The next day, Gengar ate the Max Soup and was able to Gigantamax, making Allister happy. When Ash and Goh left Stow-on-Side, Allister came to see them off, hoping they would get to meet again.

In Battling Turned Up to Eleven!, Allister watched Ash's battle against Marnie on his Rotom Phone.

In Radio Lulled the Mischievous Stars!, Allister was shown listening to Team Rocket's radio show alongside his Cursola.

In A Flood of Torrential Gains!, Allister watched Ash's battle against Leon on his Rotom Phone. When Gengar managed to defeat Leon's Inteleon, Allister was seen celebrating the victory.

Allister and Ash's Gengar


Allister is shown to be a very shy boy, avoiding contact with other people and feeling intimidated by the presence of his other friends, such as Bea and Ash. Probably because of this aspect of loneliness, Allister made great friends with Ash's Gengar, so even after they met, Allister has been following the development of the Ghost type Pokémon from afar.


This listing is of Allister's known Pokémon in the anime:

On hand
Cursola is Allister's only known Pokémon. It appeared with him as he listened to Team Rocket's radio show.

None of Cursola's moves are known.

Debut Radio Lulled the Mischievous Stars!
Traveling with
Rotom Phone
Sinistea is a Pokémon living on the ghost train riding to Stow-on-Side that is friendly with Allister. It appeared when Allister decided to help Ash who had been possessed by a spirit of a Spiritomb.

None of Sinistea's moves are known.

Debut The Spectral Express!
Voice actors
Japanese Ikue Ohtani

Voice actors

Language Voice actor
Japanese 三浦千幸 Chiyuki Miura
Hebrew שירז אלישע Shiraz Elisha
Norwegian Klara Høeg
Polish Patryk Siemek
Brazilian Portuguese Arthur Valadares
Spanish Latin America Valca Ponzanelli
Spain Alba Luque

Pokémon: Twilight Wings

Allister made a cameo appearance in Letter. He reappeared in Assistant.

In Moonlight, Allister was contemplating in a cemetery and enjoying the full moon when he sensed someone coming, which turned out to be Tommy. Tommy requested Allister's assistance in cheering up his sick friend John by getting him an invitation to one of Leon's matches. Though Allister was too shy to do this, he assisted Tommy in sneaking into John's hospital room so he could apologize for an argument they had.

In Sky, Allister gave his thoughts about Leon in an interview. He also spectated the match between Leon and Raihan together with Tommy and his Pokémon.

In The Gathering of Stars, Allister was seen with his mask off at the cemetery with his Cursola while enjoying the moonlight while his other Pokémon were seen playing with his invitation letter for the Galarian Star Tournament. He was later seen at Wyndon Stadium, walking out onto the field for the tournament's opening ceremony.


Allister is shy and prefers to keep to himself. However, he is also mischievous and enjoys scaring people for fun.


Gastly, Haunter, and Gengar
Gastly, Haunter, and Gengar are some of Allister's known Pokémon.

The three were present when Tommy requested Allister's help to visit his friend John in the hospital. They later scared the Taxi Driver.

None of their moves are known.

Debut Moonlight
Voice actors
Japanese Kiyotaka Furushima
English Kai Jordan (Gastly)
Casey Mongillo (Haunter)
Cursola appears alongside Allister in The Gathering of Stars.

None of Cursola's moves are known.

Debut The Gathering of Stars

Voice actors

Language Voice actor
Japanese Ryo Hirohashi
English Casey Mongillo


Allister briefly appeared in GOTCHA!.

In the manga

Pokémon Adventures

Allister debuted in Glittering!! The Tapestry in the Vault. Unlike the games, he and Bea alternate on who runs the Stow-on-Side Stadium as its Gym Leader. He was first seen facing Henry Sword in a Gym battle at Stow-on-Side Stadium, but he lost. Later, Allister, Casey, Marvin, and Professor Magnolia went to investigate a loud sound coming from the Stow-on-Side mural. There, they found Bede trying to destroy the mural in an unsuccessful attempt to obtain Wishing Stars. Bede ignored Allister's pleas to stop, claiming his actions were a mission from Rose himself. Before he could continue, Bede was captured by several League Staff members and approached by Rose, who disqualified him from the Gym Challenge as punishment for damaging a historic landmark.

In Shocking!! Reunion in the Forest, after learning Professor Magnolia found her Antique Form Sinistea and Polteageist at Glimwood Tangle, Allister went into the forest hoping to find some as well. Upon arriving, he and Casey found an injured Dreepy whose caretaker Drakloak was fighting Casey's missing Toxtricity, Tera. With quick thinking, Casey helped Tera win the battle, allowing her to retrieve her Pokémon. Allister then decided to catch the Dreepy and Drakloak for himself.

In PASS25, the Galar Gym Leaders gathered at Rose Tower to find out whether or not Rose intended on bringing harm to the region. Shortly after arriving, they were stopped by Oleana. While Oleana kept the Gym Leaders busy, Henry, Casey, Bede, Hop, and Marnie headed up an elevator to meet Rose, only to learn he wasn't in the building. Appearing on a video screen, Rose announced his intention to restart the Darkest Day and ensure the safety of Galar's future. Power Spot lights began appearing all over the region, causing Pokémon to start Dynamaxing at random. Allister traveled to the Hammerlocke Energy Plant with the others, but decided to head back to Stow-on-Side with Bea to help deal with the rampaging Dynamax Pokémon.

In PASS29, Macro Cosmos employees were dispatched to deal with the Dynamax Pokémon, allowing Allister's group to provide backup for the others against Eternatus. By the time they arrived, Allister's group found Eternatus had fled, leaving those who battled it unconscious and covered in poison. The injured were taken to a hospital to recover.


Galarian Yamask is Allister's first known Pokémon. It was first used to battle Henry's Lancelot in a Gym battle, but was defeated. It is housed in a Dusk Ball.

Yamask's only known move is Brutal Swing.

Debut Glittering!! The Tapestry in the Vault
Cursola is Allister's second known Pokémon. It was first used to battle Henry in a Gym battle. It managed to damage Henry's Lancelot, but was defeated by his Gunbain.

None of Cursola's moves are known.

Debut Glittering!! The Tapestry in the Vault

Gengar ↔ Gigantamax Gengar
Gengar is Allister's third known Pokémon. It was first used in Allister's Gym battle against Henry, but was defeated by his Gunbain after its Gigantamax wore off. Allister also uses it as a mode of transportation. It is housed in a Dusk Ball.

Gengar's only known move is Venoshock**.
As a Gigantamax Gengar, it can use G-Max Terror and Max Ooze.

Debut Glittering!! The Tapestry in the Vault

Dreepy and Drakloak
Dreepy and Drakloak are Allister's fourth and fifth known Pokémon. Allister encountered them in Glimwood Tangle, where Drakloak was fighting with Casey's Tera. After Drakloak was defeated, Allister caught it and Dreepy.

None of their moves are known.

Debut Shocking!! Reunion in the Forest

In the TCG

This listing is of cards mentioning or featuring Allister or his Pokémon in the Pokémon Trading Card Game.

Cards listed with a blue background are only legal to use in the current Expanded format.
Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.
Card Type English
Rarity # Japanese
Rarity #
Allister Su Vivid Voltage   146/185 Legendary Heartbeat   071/076
Vivid Voltage   179/185 Legendary Heartbeat   084/076
Vivid Voltage   192/185 Legendary Heartbeat   090/076
Astral Radiance   TG24/TG30 VMAX Climax   256/184


  • Allister was designed by take.[5]
  • According to his concept art, Allister is left-handed.
  • Allister's uniform number is "291", which can be read in Japanese as goroawase for 憎い nikui, meaning "hateful".


Language Name Origin
Japanese オニオン Onion From onion and 鬼 oni (demon, ogre)
English, Brazilian
Allister From Allium (genus that contains onions) and Aleister Crowley
German Nio From onion and 鬼 oni (Japanese for demon or ogre)
Spanish, French Alistair Similar to his English name
Italian Onion Same as his Japanese name
Korean 어니언 Eoni-eon Transcription of his Japanese name
Chinese (Mandarin) 歐尼奧 / 欧尼奥 Ōuní'ào Transcription of his Japanese name and 奧 / 奥 ào (mysterious, obscure)
Chinese (Cantonese) 歐尼奧 Āunèih'ou Transcription of his Japanese name and 奧 ou (mysterious, obscure)
Russian Аллистер Allister Transcription of his English name


Related articles

Gym Leaders of the Galar region
Turffield Stadium  
Hulbury Stadium  
Motostoke Stadium  
Stow-on-Side Stadium  
Bea Allister
Ballonlea Stadium  
Opal Bede
Circhester Stadium  
Gordie Melony
Spikemuth Gym  
Piers Marnie
Hammerlocke Stadium  

  This game character article is part of Project CharacterDex, a Bulbapedia project that aims to write comprehensive articles on each character found in the Pokémon games.