You need to get latias ( can only catch it on Pokemon heartgold) and latios (can only get it on Pokemon soulsilver) and speak to steven who is in the silph co. in saffron city.
You must get the Enigma Stone from the WiFi event, which turns out to be the Soul Dew.
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you cant but you can trade it from Pokemon soul silver
Yes, you can. You have to evolve Staryu.
Soul Dew is an event only item. They currently don't have any events that are giving it away. Currently, the only way to get it is through hacking.
In the pewter city museum. to get his attantion you must bring walking latias ( heartgold) or latios ( soulsilver ) with a soul dew from a mystery gift. then he will take you to saffron city. he will talk to you for a while. then he will go back to pewter then show you latios ( heartgold ) or latias ( soulsilver ) outside of the museum. then after you defeat or catch one of eon Pokemon that's the last of him.
Capture either a latios or latias