Once you get out of Ilex Forest and are in Route 34, leading to Goldenrod City, go up to the female trainer surrounded by grass. Her name is Gina and she has two lvl. 9 Hoppips and a lvl. 12 Bulbasaur. Defeat her and get her phone number. Continue on your journey. Every now and then she will call you - most times chatting about something insignificant or wanting to battle you - but when she says that she found something nice that she'd like to give you, fly or run back to Route 34 as fast as you can. Talk to her and she will give you a Leaf Stone.
This isn't a one-time thing, either. Every time she calls you saying she has something, she'll keep on giving you leaf stones. But don't expect it to be immediate or frequent - when I play and get her number and continue on the story, I usually don't get a call until I'm around the sixth or seventh badge.
go down from mossdeep until you reach the diving area. Look for green shards and when you find one give it to the treasure hunter(he's left of mossdeep) and he will trade a leafstone for the shard that you've found.
South of Fortree City. Go to the river and surf down until you find it turns gloom into vileplume, nuzleaf into somthing, etc.
The leaf stone is used to evolve certain grass type Pokémon. You can find one in Sapphire version near Fortree city.
You must get a leaf stone by trading in a green shard to the man in the cottage in the ocean by Mossdeep City.
You can get all the stones at pokeathelon including leaf stone
at the pokethlon dome on a specific day (don't ask don't know) and it costs 2500 points.
vermilion forest
or go to the pokeathlon
or show bills grampa a pokemon
Gloom
Lombre
gloom into vileplume.
I am sure you get it from victory road.
Nuzleaf will evolve into Shiftry and the leaf stone will turn Gloom into Vileplume.
Pokemon requiring a stone to evolve:Eevee - Thunder stone, Jolteon (you can't find this Pokemon in Ruby) Eevee- fire stone, Flareon (you can't find this Pokemon in Ruby)Eevee- water stone, Vaporeon (you can't find this Pokemon in Ruby)Sunkern- sun stone, Sunflora (you can't find this Pokemon in Ruby)Jigglypuff- moon stone, WigglytuffSkitty - moon stone, DelcattyNidorino- moon stone, Nidoking (you can't find this Pokemon in Ruby)Nidorina- moon stone, Nidoqueen (you can't find this Pokemon in Ruby)Growlithe- fire stone, Arcanine (you can't find this Pokemon in Ruby)Gloom- sun stone, BellosumGloom- leaf stone, VileplumeStaryu- water stone, StarmiePikachu- thunder stone, RaichuLombre- water stone, LudicoloNuzleaf- leaf stone, ShiftryVulpix- fire stone, NinetalesHappiny- oval stone Chansey
To get the leaf stone in Pokémon Ruby you need to first go to the area of the Weather Institute. Next surf north to the waterfall and you will find the stone.
nuzleaf evolves with a leaf stone
Weepinbell, Gloom and Exeggcute.
gloom and nuzleaf to shifery
around level 43 :)
Go to liyovile city and then go to the general store and buy it