Clefairy evolves into Clefable using a Moon Stone. (Cleffa evolves into Clefairy when leveled up with high friendship.)
Clefairy is #35 in the National Pokedex, and was introduced in the Generation I Pokemon titles (Red, Blue, and Yellow) where it could be found on Mount Moon (or in Red and Blue at the Rocket Game Corner). In Generation VI (X and Y), it is available through some Fairy-type Friend Safaris.
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Do NOT level this up with Rare Candies. All you need to do is to use a Moon Stone on it; it doesn't have to be a specific level.
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if you want to evolve clefairy you must have a moon stone you can get one at MT.Moon
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.
Cleffa won't evolve on certain level. If it levels up while it adores you it will evolve to clefairy.
Clefairy evolves into Clefable. Use moon stone on clefairy to evolve it into Clefable.
It does not evolve at a certain level but Cleffa evolves into Clefairy when you level it up when it has high friendship. It then can evolve into Clefable when exposed to a moon stone. Happy Pokemon Catching J.R.