it doesn't evolve any Pokemon in sinnoh (trust me i have caught all the Pokemon and it doesn't do anything)
...Actually, it evolves some Pokémon from Kanto, Hoenn, and Unova: Gloom, Weepinbell, Exeggcute, Nuzleaf, and Pansage. But technically it doesn't do anything on its own, now, does it? :P
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You get a leaf stone underground.
You can't I've tried looking but there in no leaf stone
The leaf stone will evolve certain species of pokemon
to evolve gloom you need a leaf stone or a sun stone. sun stone=Bellossom leaf stone=Vileplume you can get a sun stone from a person in the space station and a leaf stone on route 119. hope i helped :)
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.