Route 34.
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On route 34.
First, capture a Ralts from a Pokemon Swarm (or trade from someone else). It must be a male Ralts. Then, evolve it into a Kirlia. Then, use a dawn stone to get a Gallade.
the Pokemon guide book tells you wherethe only way i know how to get a ralts in soul silver or heart gold is to listen to the radio in the poke-gear and when it says "a swam of RALTS" (must say ralts) on route 34 go to the route and the very last group of grass go to the back near the tress and just hope you find one
you can find ralts in route 102.
you can not get regirock in soul silver but in platinum you can in a special event.