You can use the Sun Stone on:
Gloom, Seedot, and Cottonee (I think.)
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Bellosom- the evolved form of Gloom through the use of a Sun stone
gloom elvolves with sun stone
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
The Sun Stone is an evolutionary stone that allows certain Pokemon to evolve. The following Pokemon can evolve using this stone: Gloom, Sunkern, Cottonee, Petilil, and Heliotile.
Nuzleaf is evolved with a Leaf Stone.