Ann is one of Daniela's kindergarten students. Along with her classmates, Ann befriended a Trubbish and brought it to class. Lila said the class couldn't keep it and her point was made when it released a bad smell. Lila took the Trubbish to the junkyard despite Ann's affection towards it. Ash became friends with Ann even though she threw mudballs at him when they first met on the road. Ash helped sort out the disagreement regarding the Trubbish and the class was able to keep it.
Ann, like the other kids from the Kindergarten, befriended Trubbish knowing that Daniela wouldn't like that. After Trubbish saved the kids from the base's destruction.It's known moves are Poison Gas, Sludge Bomb and Toxic Spikes.