I geted it from Alan Schoolboy.
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Growlithe doesnt evolve by level! It evolves by fire stone! to get the fire stone, you have to battle some trainers and get their phone number and they will call u when they find a stone to give you. you cant buy a fire stone
one of the only and the best fire pokemon you get on pokemon crystal is Growlithe, because when you evolve it with a fire stone it evolves into Arcanine, which is pretty tough. but remember to evolve it after growlithe turns to level 34, after it learns flame wheel. and also remember that you cant evolve it without a fire stone! :)
u find fire stone fron alan schoolboy who is stand near weird tree.(where u encountered sudowudo..) hope this will help
The Market in Celadon City.
I believe you cant find/buy a thunderstone in crystal i think the only way to get a stone is to some person, and give him/her your phone number later in the game he/she will call you about a stone