use a moonstone to make it evolve
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Clefairy cannot evolve into Clefable by leveling up in Pokemon FireRed. The only way to evolve Clefairy is by using a Moon Stone on it.
if you want to evolve clefairy you must have a moon stone you can get one at MT.Moon
You have to use a moonstone
Clefairy will evolve when a Moon Stone is used on the pokemon. Go into the Bag and find a Moon Stone press A on it then Press A on Use then go to Clefairy press A and the evolution will begin.
clefairy,jigglypuff,nidorino & nidorina