well... U CANT :)
It's called a dusk stone and it evolves murkrow and misdreavus. You can look up more about it on serebii.net.
Gloom Nuzleaf There may be more....
a boy kirlia will evolve into gallade with a dawn stone (beware it must be a boy) i have done this and a gardvoir is more powerful than gallade.
Stone for stone, a diamond is more expensive than an emerald.
It depends on thew Pokemon. Most Pokemon evolve by gaining exp. Here are some Pokemon that evolve with a stone. Evee- can evolve into 7 different Pokemon depending on the stone Lombre- water stone pikachu- thunder stone there are many more
alot That narrows it down doesn't it?! You should be more specific and give a few examples...
No, by weight, a diamond has higher value than platinum.
Stone for stone, a diamond will cost more than a sapphire.
No you can not have more than one login in Pokemon diamond.
An iolite stone is not a diamond. You can read more about it, below.
Hmm Eevee, Growlithe, Vulpix. That's all, if I remember correctly. Correct if any more.
i know eevee can use water fire and thunder stones , Roselia can use a shiny stone, victrebell can use a leaf stone, clefairy can use a moon stone, and I think just think cherim can use a sun stone. i know theres more though