Whenever you cross the bridge into that town, go to the dock that is the farthest right then go down. There should be a scientist. Talk to him. Now if your trying to evolve the monkeys, choose the monkey you have. If you want it to evolve a different Pokemon, then Pansage gets you the Leaf Stone, Pansear gets you the Fire Stone, and Panpour gets you the Water Stone.
Hope I helped,
-Ian
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The fastest way is to earn points on the Pokemon-a-thon and buy a Leaf Stone there for 2500 points. The Leaf Stone is available at Thursdays I think. You can also get a leaf stone from Bill's Grandpa if you show him an oddish, he is just above Cerulean city. and you can find a leaf stone in viridian forest.
Almost everyday you will find a leaf stone at the pokeathlon (north of goldenrod city). In the Johto region. Hope I helped!
nowhere, find a green shard and bring it to the shard hunter near mossdeep city... he will trade it for a leaf stone
I believe it is something like a shiny Pokemon or shiny leaf stone. Getting a shiny Pokemon takes LOTS of luck, and a shiny leaf stone I think you find in patches of grass outside of Violet City in HeartGold. Hope this answers your question
you have to get a leaf stone which you can find on the down, right side of the bridge after you pass the weather institute then evolve your lombre. you can also get a leaf stone by getting a green shard and trading it for a leaf stone.