Wallace

Wallace was once the Gym Leader of Sootopolis City, the champion of the Pokémon League, and now a Pokémon Coordinator. He is dressed in a white clothing and have a light blue hair. His Milotic is one of his strongest Pokémon. He seems to be very emotional and feminine. He is the head judge in the Wallace Cup.

In the games
Wallace is the gym leader for the Sootopolis City Gym in Ruby and Sapphire. Wallace steps down as a gym leader in Emerald and gives the position to his former teacher Juan, and replaces Steven Stone as the Champion. Wallace specializes in -type Pokemon and has Milotic, Gyarados, and others.

In the anime
Wallace is a Pokémon Coordinator and once a gym leader and a champion before. He is found on Lake Valor with his Milotic. He encourage Ash to participate in the Wallace Cup with his Buizel.

Wallace is one of the four judges in the Wallace Cup. Every time a participants have completed his appeals (except for Jessie or Jesselina), he would stand up and stretch out his hand while explaining just how beautiful the appeal is.

Wallace awards Dawn the Aqua Ribbon when she won the Wallace Cup.

Ruby and Sapphire Arc
He agreed to be Ruby's mentor when he saw that Ruby was actually good at pokemon battles, even though Ruby was hiding it.

Trivia

 * He used to be with Winona in the Manga, but for some reason aren't anymore.