Route 34, but only during a swarm. It will be level 10.
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Route 34 when on the radio they say that there is a large number of ralts in that area
find a ralts i think route 34
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
Ralts is a swarming Pokemon at Route 34. You can also trade or transfer a Ralts from another game.
Ralts evolves into Kirlia at level 20.