From Bulbapedia, the community-driven Pokémon encyclopedia.
The Ball Guy (Japanese: ボールガイ Ball Guy) is a character introduced in Pokémon Sword and Shield.
In the core series
The Ball Guy is the mascot of the Galar Pokémon League. Over the course of their Gym Challenge, the player will meet a person dressed in a Ball Guy mascot costume in or near each Stadium Lobby, who will give them a variety Poké Ball with each meeting. It is later revealed that the person dressed as the Ball Guy is not sanctioned by the Pokémon League and has been acting of their own volition. Their true identity is unknown. The player can receive the Ball Guy's League Card outside of Motostoke Stadium after they become Champion. The Ball Guy mascot will also reward the player after defending their title in Wyndon Stadium.
This is a transcript of the back of the Ball Guys's League Card in Pokémon Sword and Shield.
- "This mysterious figure has taken it upon himself (herself?) to dress up in the fashion of the Pokémon League's official mascot. The mysterious individual is known to many as "the Ball Guy" but in point of fact, all are mystified when it comes to this person's true identity or age or even gender. While the Ball Guy is known for her (his?) habit of handing out rare Poké Balls here and there around Galar, it's a mystery as to why or even where these balls come from. It's all very mystifying..."
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Reason: Wyndon Stadium rematch rewards.
In the manga
In the Pokémon Adventures manga
Shirudomiria was seen wearing a Ball Guy mask at the beginning of the Sword & Shield chapter.