PokéBase - Pokémon Q&A
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1 Answer

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If you have the Enigma Stone he will be in Pewter City museum.

Otherwise I think you need to talk to the copycat girl in Saffron City, then go to the fan club in Vermillion to get her doll, then you will see Steven when you leave.

You also find him just when you get into Vermillion I think (I'm a bit rusty on the storyline locations for Steven.)