You can receive a Leaf Stone in Pokémon SoulSilver by winning first place in the National Park Bug Catching Contest, receiving one from a trainer in Route 34 after receiving a PokéGear Phone call, finding one in the Viridian City and then you can also receive one by receiving one from Bill's Grandfather in Route 25 after you have showed him an Oddish, the Leaf Stone will evolve Exeggcute into Exeggutor, Gloom into Vileplume, Pansage into Simisage, Weepinbell into Victreebel and Nuzleaf into Shiftry.
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at the Pokemon dome by the bug catching contest where you exchange your points for prizes u can get one but it is on a certain day only
use a leaf stone
You can evolve Gloom by a sun stone, or a Leaf stone. Sun stone= Belossom Leaf stone= Vileplume
Get a Leaf Stone and you'll evolve it.
in Viridian Forest looks like a pokeball
In order of how he wants to see them (based on Heart Gold and Soul Silver): Gold/Heart Gold: Oddish - Leaf Stone Growlithe - Fire Stone Pichu - Thunderstone Jigglypuff - Everstone Marill - Water Stone Silver/Soul Silver: Lickitung - Everstone Oddish - Leaf Stone Staryu - Water Stone Vulpix - Fire Stone Pichu - Thunderstone