PokéBase - Pokémon Q&A
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Cleffa evolves through happiness. So all you have to do is get its happiness up a lot and it'll eventually evolve.

There are several ways to raise a Pokémon's happiness. Just winning battles with it will raise happiness.
For info on raising happiness, you can read about that here

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Cleffa evolves into Clefairy by leveling it up at Max Happiness.
Source: http://pokemondb.net/pokedex/cleffa

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