Nothing more than a Crazy Old Man.... probably.
You don’t know anything about Roshi’s Gym Challenge, or his roster.
Summoned by the ringside bell in Pewter City’s Gym, this old man favors comfy shorts, seaside shirts, carries an old gnarled staff, and is characterized by his gap toothed grin, scratchy voice, and sideways comments towards women.
For whatever reason, This decrepit geezer has been placed in charge of handling any challenging trainers.
maybe they just sic him on the new trainers, and keep the real Gym Leader hidden away for proper fights.