Ah, you continue to get my hopes up, my dear, only to dash them so mercilessly - I'm wounded, truly, but I suppose I'll just have to make do.

Unfortunately, when it comes to your query, about the only thing I can tell you is that several of the stones used to make the little beasts evolve are in Goldenrod City. There's some sort of disturbingly large store in the middle of town; if you manage to miss that somehow, you're a bit beyond any help others might be able to give. Wander around long enough in there and you'll find what you're looking for; if Barry can manage to navigate the place, I've no doubt you can.