From Bulbapedia, the community-driven Pokémon encyclopedia.
Janet (Japanese: メグミ Megumi) is a character of the day who appeared in All Things Bright and Beautifly!.
Janet is a Pokémon Coordinator who entered the Rustboro City Contest alongside her friend and rival, Chaz. She passed the Appeals Round with a perfect score of 30 points and made it to the final round. In the end, she and her Beautifly defeated Chaz and his Venomoth, granting her one more Ribbon.
Janet is the person who inspired May to become a Pokémon Coordinator and to catch her very own Beautifly. In the episode, she let May and Max assist her during the Contest.
Janet appeared in a flashback in All in a Day's Wurmple. She was also mentioned by May in The Winner by a Nosepass.
Janet was mentioned by May again in Hi Ho Silver Wind!, who noted that they stayed in touch while traveling.
Two of Janet's three Ribbons
A Janet look-a-like on the right