Gardevoir is a humanoid sylph-like, Pokémon. It stands just over five feet tall. The classical tutu-type skirt seen with Kirlia is now a long, flowing white gown that completely covers its legs, giving the appearance that it is floating. Gardevoir have long, slender, white legs underneath their gown. The inside of its gown is green in color. The red horns that were once on Kirlia and Ralts' head have moved down onto Gardevoir's chest and back. Most of its face is obscured by its green 'hair', with only some white, and its large pink eyes visible. It also has long, slender arms that are green like its hair.
Gardevoir is famous for its loyalty; it will even sacrifice itself for its Trainer's sake. In the wild, Gardevoir live in groups and care for their young lovingly. Gardevoir are very wary of trusting strangers, but will develop the same loyalty they show to their trainers to those who show similar compassion and optimism.