Top Coordinators are trainers who won the Grand Festival. The first one to win the Grand Festival onscreen was coordinator Robert in the Hoenn Region. His known pokemon are Milotic and Claydol, which gave him the victory. He was the first coordinator to defeat Drew onscreen at the Slateport Contest. He also gave some tips to Ash's Snorunt on how to focus his ice beam attack. He had a small role in the anime and not much is known about him.
Dr. Abby was the first top coordinator to be introduced in the anime, but by the time May & co. meet her, she is already retired and working as a pokemon doctor. She learned there are different ways to interact with pokemon and decided to move on from contests. Her Skitty evolved into Delcatty and helped May's Skitty learn Blizzard attack.
Yuma is a top coordinator and Breeder who decided to pursue a career training beginner coordinators. She considered taking Brock under her wing, but after seeing his impressive performance at the pokemon contest she decided to pass and teach another student instead.
Juan is the 8th gym leader Ash faces when traveling in the Hoenn Region, but he is also a top coordinator and has a dedicated fanbase. He owns a variety of water pokemon such as Sealeo, Luvdisc, Seaking, Milotic, Whiscash, Seadra, Gorebyss, Azurill, Corsola, Goldeen, Wailmer, Barboach, Chinchou etc. He does not use all of them in gym battles and some are shown on his water shows.
Soledad became the winner of the Kanto Grand Festival. She defeated May in the Top 4 and proceeded to defeat an unknown coordinator in the following round. Her pokemon team consists of Butterfree, Slowbro, Lapras and Pidgeot. She met May before the Grand Festival began and revealed she defeated Drew on his first ever pokemon contest.
Wallace is well known for being the gym leader of Sootopolis City and becoming Champion Master of the Hoenn region. However, eventually he also became top coordinator and began hosting his own competition "The Wallace Cup" in which he participates as an extra judge. His main pokemon is Milotic.
Johanna is well known for being Dawn's mother, but back in the day she was a fierce pokemon coordinator and eventually won the Grand Festival. Her only known pokemon are Glameow and Umbreon. She also teaches contest classes and served as a contest judge one time that Nurse Joy was unable to make it.
Fantina is well known for being absent from her gym, but she also is a top coordinator and served as a special guest judge at the Sinnoh Grand Festival. She specializes in ghost type pokemon and some of her pokemon are Gengar, Drifblim and Mismagius.
During Dawn's adventures in Sinnoh it is confirmed that Marina has become a top coordinator. There's a video of her performing in the pokemon contest site. She used Feraligart and Jigglypuff for her demonstration.
Zoey became top coordinator in the Sinnoh Grand Festival after narrowly defeating Dawn in the final round. She is also the only top coordinator to have a full team of six pokemon onscreen. Her team consists of Glameow, Gallade, Mismagius, Leafeon, Gastrodon and Lumineon. She is also one of few top coordinators to be a major recurring character in the anime, as she served as both a friend and rival to Dawn.