They are a trio of Villainous Pokemon from Pokemon Scarlet and Violet. They were added in the DLC and are the main antagonists of the Teal Mask DLC storyline where they bully the Pokemon, Ogerpon. They were turned to what they were by Pecharunt, the Scarlet and Violet mythical pokemon. Okidogi, the dog, used to be weak and feeble before Pecharunt made it strong. Munkidori, the Monkey, used to be stupid before Pecharunt made it intelligent. Finally, Fezandipiti, the bird used to be ugly before Pecharunt made it pretty.
