You'll need to evolve male Kirlia with a Dawn Stone.
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get a male and give it a dawn stone
ralts sucks until it evolves into gardevoir or galade and then its an amazing Pokemon and i personally recomend gallade.^
They are not in Pokemon HeartGold
You have to trade it to HeartGold from P/D/Pt
Only by trading a Squirtle to HeartGold.