In Route 203 and Route 204 in the South part, with using the Poke Radar.
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you cant get gardevoir but you can catch either ralts or kirlia and evolve it int gardevoir(ralts to kirlia to gardevoir to gallade
you cant. But you can get it in peal and trade it to diamond.
Catch a Kirlia in the North of route 212 and evolve it.
I don't think you can. You'll either have to trade with another game or maybe use a cheat. However, Pokemon Platinum has a kirlia. Hope this helps..............
No, Kirlia is a psychic Pokemon