Cleffa evolves when it's happiness is at it's max. Try getting massages from the woman in Vailstone City, in the house near the gym with the bald guy out the front. Also, try collecting loads of ribbons from people like the ribbon lady in Sunyshore City as then you can enter the Ribbon Syndicate in the Resort Area and you can have a massage there which is very effective.
it is a clefairy.
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Cleffa won't evolve on certain level. If it levels up while it adores you it will evolve to clefairy.
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
Magikarp evolve at level 20.