From Bulbapedia, the community-driven Pokémon encyclopedia.
Wendy (Japanese: ジンジー Gingie) is character of the day and member of Team Rocket who appeared in Dues and Don'ts. Her English voice actress is Lisa Ortiz and her Japanese voice actress is 日高奈留美 Narumi Hidaka.
Wendy works in human resources for Team Rocket, and holds a grudge against Jessie because of something that happened years earlier. One day, they were working out and got a smoothie at the Rocket Café. Jessie downed Wendy's smoothie and said "I'll pay you back someday." While Jessie forgot this over time, but Wendy never did, and thus holds a constant grudge against her. Wendy got her "revenge" when she added the price of the smoothie to the trio's Team Rocket bill. Unbeknownst to her, Jessie didn't pay any attention to it. She refers to Giovanni as "master."