You have to use a moonstone
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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.
Clefairy cannot evolve into Clefable by leveling up in Pokemon FireRed. The only way to evolve Clefairy is by using a Moon Stone on it.
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.
if you want to evolve clefairy you must have a moon stone you can get one at MT.Moon
use a moonstone to make it evolve