Garchomp, Gastrodon and Glaceon are the Pokemon that Cynthia has in the anime
Garchomp is her main Pokemon.
Gastrodon first appeared in the episode double team turnover where it battled Saturn and Team Galactic Grunts. It also appeared in her battle with Aaron.
Glaceon has only ever been seen once in the anime so ver little is known about it.
Hope I helped !