That's impossible. Cleffa is only obtainable in firered/leafgreen
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You cant
The trainer on Route 209 has Cleffa in Pokemon Platinum. Cleffa is a fairy type Pokemon and can evolve into Clefairy.
You must trade from FireRed or LeafGreen
I'm pretty sure Cleffa isn't in Pokemon crystal, but if it is, then yes.
Cleffa evolves by happiness. She doesn`t evolve by a certain level.