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This mysterious Trainer became the Gym Leader of Stow-on-Side Gym at a very young age. He is known to have a 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 spent most this time alone in ruins and cemeteries[1]. He also keeps about 100 masks with the same design needed in the event his mask falls off. According to Allister, he claims to have the ability to see deceased Ghost-type Pokémon after a supposed accident at the age of 4.
"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."
In Moonlight, Tommy requested Allister's assistance in cheering his friend John up by getting him an invitation to one of Leon's matches. Though Allister was too shy to do this, he assisted him in sneaking into the hospital where John was being kept to apologize for his earlier rude behavior.