In Pokemon Leaf Green, there are the Sun, Water, Fire, Thunder, Moon, and Leaf stones. The most common stones are the Water, Fire, Leaf, and Thunder stones, which can be purchased in Celadon City
The Evolutions are as follows:
Sun
* Gloom: Sun Stone: Use the Sun Stone on Gloom for a Bellossom
Fire
* Eevee: Use the Fire Stone on Eevee for a Flareon * Growlithe: Use the Fire Stone on Growlithe for a Growlithe Moon
* Jigglypuff: Evolves to Wigglytuff * Clefairy: Evolves to Clefable Water
* Eevee: Evolves to Vaporeon * Staryu: Evolves to Starmie Thunder
* Pikapoo: Evolves to diarrhea * Eevee: Evolves to Jolteon Leaf
* Gloom: Evolves to Vileplume * Weepinbel: Evolves to Victreebel There's likely more, but I'm not sure (and if I asked on here, it would defeat this answer's purpose)
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You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.
You can't on leafgreen.
Aerodactyl does not evolve lolk?
Rhydon, in Pokemon FR/LG, does not evolve.
Mamoswine doesn't evolve either way because it doesn't exist in Pokemon LeafGreen. It evolves from Piloswine who evolves from Swinub, but Piloswine can't evolve into Mamoswine in LeafGreen.