The shiny Bidoof resembles an ordinary Bidoof, with the same bucked teeth and fur style. The major difference is its fur's color, which is a lighter brown compared to other Bidoofs.
The shiny Bidoof was hiding in the bushes on the route where Rusty challenged the Bug Catcher to a battle. After the Random Bystander fled, the shiny Bidoof jumped out at Rusty, exciting him. He tried to throw a Poké Ball to capture it, but instead ended up trapping himself in the Poké Ball. The shiny Bidoof fled as Rusty told Pikachu to get help.