Cleffa evolves by happiness. She doesn`t evolve by a certain level.
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The trainer on Route 209 has Cleffa in Pokemon Platinum. Cleffa is a fairy type Pokemon and can evolve into Clefairy.
I'm pretty sure Cleffa isn't in Pokemon crystal, but if it is, then yes.
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.
Cleffa won't evolve on certain level. If it levels up while it adores you it will evolve to clefairy.
freindship evolution