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.

Allister/Onion
"My very last Pokémon... How lonely... How frightening..."
Gender: Male
Type: A Silent Boy of Mystery!
Age: Unknown
Species: Ghost
Portrayed by: Ryan Bartley (English, series)
Casey Mongillo (English, Twilight Wings)
Chiyuki Miura (Japanese, series)
Ryō Hirohashi (Japanese, Twilight Wings)
Status: Alive(?)
Media of origin: Pokémon
First appearance: Glittering! The Tapestry of the Vault

He's a young and shy yet talented trainer that specializes in Ghost-type Pokémon; he's most notable for always wearing a mask in public appearances because of his shyness.

He's voiced by Casey Mongillo in Pokémon: Twilight Wings, Nicole Gose in Pokémon Masters EX, and Ryan Bartley in the mainline Pokémon anime

In the core series games

Allister is the fourth Gym Leader Galar Trainers face in their Gym Challenge in Pokémon Shield. Like most of the other Gym Leaders, he's initially introduced during the Gym Challenge opening ceremony at the Motostoke Stadium. He can later be encountered and battled at his Gym. He also serves as the player's second opponent in the Champion Cup Finals.

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. 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.

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.

Why He's a Silent Boy of Mystery!

  1. Allister has in fact, a really interesting looking design that can hopefully catch the eyes of many people.
  2. Despite his young age, he's really good at Pokémon battles and can always give other trainers like him a challenge.
  3. While he at first may seem to be evil, he has a good heart filled inside of him, as he helped Tommy after the later had an argument with John in Pokémon: Twilight Wings.
  4. His voice provided by Casey Mongillo sounds really fitting for him, considering that he's supposed to be a young kid.
    • Nicole Gose's voice, while making him sound rather older than he actually is, is also decent.
  5. Despite being shy, he also is capable of making friends, most notably Tommy.
  6. Because of his overall characteristics such as design and personality, he's been popular with the Pokémon fanbase and has earned lots of fanarts.
  7. While on your road to catching Zamazenta (Shield's exclusive Legendary Pokémon), there's a chance you might see his mask off when he gives you his second league card after helping him.

Lonely & Frightening Qualities

  1. His shyness can be a disadvantage for him at times, such as when he first met Tommy.
  2. Even though he isn't evil, he's been shown to act questionable at times, such as when he says "Gengar...Gigantamax...Swallow everything in darkness..." during his fight, complete with an angry-like face.
  3. His voice by Nicole Gose, while decent, makes him sound older than he really is.

Trivia

  • He's exclusive to the Shield version, as in the Sword version, you fight against Bea.
  • His mask resembles that of the Mario character, Shy Guy.
  • Allister was designed by take.
  • 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".
  • According to in-game lore, Allister suffered a really horrible accident when he was 4 years old, which also is implied to be the reason on why he can communicate with ghosts.

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