Nothing.
Cleffa evolves into Clefairy by happiness.
Clefairy evolves into Clefable by Moon stone.
Clefable is the last Pokemon of the evolution chain.
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Clefairy evolves into Clefable. Use moon stone on clefairy to evolve it into Clefable.
Clefable is the last evolved form and does not evolve.Cleffa evolves to clefairy by happiness+lvl up.Clefairy evolves to clefable by using a moon stone on it.
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.
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.
Nidorina ---> Nidoqueen Ninorino ---> Nidoking Clefairy ---> Clefable Jigglypuff ---> Wigglytuff Skitty ---> Delcatty