If your Ralts is male, then it goes from Ralts, Kirlia, Gardevoir, OR if you give it a dawn stone before evolving it into Gardevoir, it evolves into Gallade. If it is Female, it cannot evolve into Gallade, it will always be a Gardevoir.
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Ralts evolves at level 20
You must first evolve Ralts into Kirlia and then you must use a Dawn Stone to make it evolve into Gallade.
level up Ralts to 20 let it evolve then and then 30 to Gardevoir. I find it easier if yo let ralts level up to 29(better if you have an everstone) let it evolve then to 30.
Ralts evolves into Kirlia at level 21. Hope I helped.
Ralts evolves into Kirlia at level 20.