Guess who? It’s Alyson L. Rosenfeld!
And this is her Twitter post regarding the news:
For your information, she’s the voice of Rio in the Zexal dub, as well as the voice actress of Nurse Joy, Bonnie, Audino and a few other additional voices in Pokemon.
Source: Ms. Rosenfeld’s Twitter (https://mobile.twitter.com/AlysonRosenfeld/status/537644133419331584)