Chimecho is unable to evolve as of Pokemon X and Y. Chimecho does evolve from a Pokemon called Chingling when it's at max happiness and during night time.
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chimecho when you increase it's happiness and grows a level
chimecho does not evolve into anything else, but it does evolve from a chingling. To get a chingling to evolve, you must level it up with a high enough friendship, (by feeding poffins to it, winning battles, spending time outside the PC, and going to the spa on the battle frontier island). BUT you must level it up between the DS's time of 8 PM and 3.59 AM. Hope this helps!! =]
You must evolve Chingling.
Catch chingling in Mt. Cornet. then evolve when happy at night
It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.