Vivian Meridian
From Bulbapedia, the community-driven Pokémon encyclopedia.
Vivian Meridian is a character in the Pokémon Anime. She is the Hoenn contest announcer. She also judges the Kanto Grand Festival Her English voice actress is Lisa Adams.
Vivian's job is mostly to reiterate what is going on during the Pokémon contest, similar to an announcer at a sporting event. In addition, she also introduces the coordinators as they enter the stadium.
Vivian is the sister of Lilian. The two of them look idenical apart from what side the mole on their face is on.