um good question have you tried to go use the explore kit? If you did not try or i suggest the cheat ds game. bye hope i helped
Leaf stones and other evolutionary stones can be purchase at the fourth floor in the celadon city dept store.
In Pokemon Leaf Green, Exeggcute (into Exeggutor) Gloom (into Vileplume), Weepinbell (into Victreebel)
When you want it. It evolves with Leaf stone.
You need to use a Leaf Stone
Leaf stone on Exeggute. They cannot be found in the wild
Weepinbell will evolve when you use a leaf stone on it.
Bellsprout which evolves to Weepinbell then Victreebel (by leaf stone), Bulbusaur which evolves to Ivysaur then Venusaur, Tangela.
Go to the Celadon City department store and buy one.
You have to get an Oddish first, then evolve it into Gloom. After that you give Gloom a Leaf Stone and he will evolve into Vileplume.
Bellsprout > lvl 21 > Weepinbell > leaf stone> Victreebel
evee can evolve into any of its forms in leaf green.all you have to do is to buy the evulation stone you want and use it on evee
Celadon dept. Store
The leaf stone will evolve certain species of pokemon