route 38
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You get it from lass Dana route 38, Mystery gift, or on route 25.
get lass dana's number and she will say she has something for you
One is given to you by Bill's Grandfather on Route 25 when you show him a Pichu. The other is given by Lass Dana on Route 38 after you defeat her in a rematch. I suspect there are only these two in the game as only two Pokemon evolve via Thunder Stone in Pokemon Crystal: Pikachu and Eevee.
She should be on route 38
After you battle and beat the gym