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.
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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.
pidgeotto will evolve at level 36
Ghastly will evolve at level 20.
At level 33.
Level 24.