You can't catch a Gardevoir in Pokemon Emerald.
To obtain one you can catch a rare Ralts on Route 102 and evolve in into a Krilia, and then a Gardevoir.
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You get Gardevoir by evolving Ralts to first Kirlia at lvl 20 and it will evolve to Gardevoir at lvl 30
you cant get gardevoir but you can catch either ralts or kirlia and evolve it int gardevoir(ralts to kirlia to gardevoir to gallade
mosdeep gym or from gardevoir
lv.30.
Gardevoir. It has very high special attack.