Cleffa won't evolve on certain level. If it levels up while it adores you it will evolve to clefairy.
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Cleffa evolves by happiness. She doesn`t evolve by a certain level.
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.
You have to become friendly with it, then level it up
freindship evolution
The trainer on Route 209 has Cleffa in Pokemon Platinum. Cleffa is a fairy type Pokemon and can evolve into Clefairy.