battle lass "Dana" to get her phone number, after waiting a while (2 gym's or just alot of walking and training) she will call you and give you a thunderstone after talking to her again (in front of her)
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i have Pokemon soul-silver and i evolved my evee using a thunderstone
If you show Bill's dad a certain pokemon he will give you a evolution stone. He will totally give you a thunderstone. The last pokemon you show him is pichu, but after that you don't show him a pokemon forever.
On route 34.
near 5th gym
I advise you to use your map.