Iris was one of Ash's traveling companion from the Unova region. She was voiced by RawrKittyPanda.
After being asked by Serena who she was, Ash told her a story about a girl he knew called Iris. Like Serena, Iris was revealed in a flashback (following the flashback that was already seen) to have had a falling out with Ash. While playing hide and seek, ash threw a Pokeball at Iris' head, angering her. Ash then compared her to Dawn, a girl he traveled with in Sinnoh. Iris then asked who Dawn was.
Time Flies (Flashback)
Ash Ketchup Remembers Charizard