go to the big brown building and talk to the bald guy sat at the table on the ground floor after talking to him the museum is no longer blocked by team aqua/magma, go to the top floor and he is the scientist
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You have to beat the Dewford Gym then go in the museum in Slateport where there was a long line of Team Aqua, he's on the second floor.
You cannot catch it in the wild. You'll need to:Trade for itTransfer it into the Poke Transfer Lab.
You can't find a Dawnstone in Pokemon Emerald
he is the champion in emerald
it depends on the Pokemon that are evolving