Go to Mt. Moon square about 6-8 pm.
Then go to the area with water.
There would be clefairys.
Once you go nearer they would go away.
Then they will leave a poke ball.
A moon stone is inside.
Note: only on mondays.
HOPE THIS HELPS ^_^
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The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
You cant get you need to catch a jigglypuff and you give it a moon 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
It will evolve jigglypuff into wigglytuff, clefairy into clafable, nidorina into nidoqueen, and nidorino into nidoking.
use a moon stone