Jasmine is the Olivine City Gym Leader in the Johto region. She specializes in Steel-type Pokemon but also owns an Ampharos (Electric-type).
In her first appearances back in the original series; specifically episode 208 ("Fight for the Light") and episode 224 ("Nerves of Steelix") she was voiced by Tara Jayne of the 4Kids Entertainment cast.
In episode 180 of the Diamond and Pearl series ("Four Roads Diverged in a Pokemon Port!") she was voiced by Alyson Leigh Rosenfeld.