you can buy them in a big market place (a market place with different floors)
i believe with a leaf stone
evolve eevee using a leaf stone
exeggcute > leaf stone > exeggutor
Gloom and Weepinbell.I think there are some more Pokemon that evole with a leaf stone but I forgot....
Exeggcute > leaf stone > Exeggutor
yes you can by going to the under ground and mining
To evolve Weepingbell into Victrebell, you need to give it a leaf stone.
To evolve Weepingbell into Victrebell, you need to give it a leaf stone.
use a leaf stone
You can get the thunder stone by going underground and digging for it in Pokemon diamond/pearl ( the thunder stone , fire stone, water stone, and the leaf stone is very rare, so good luck!).
The evolution stones in Diamond/Pearl/Platinum are the water stone, fire stone, thunder stone, moon stone, leaf stone, sun stone, dusk stone, shiny stone, and dawn stone. (Sorry if I missed one) And even though this is the opposite answer, the stone to keep Pokemon from evolving (with or without evolution stones) is the everstone. Hope this helps! :)
Contrary to popular belief, eevee does not evolve into leafeon by using the leaf stone. To evolve eevee to leafeon you must level it up by the mossy rock in the Eterna Forest. Other Pokemon that evolve using the leaf stone are: gloom to vileplume, weepinbell to victreebell.