Go to Victory Road, then battle a Psychic person. Note: There are two of them so one of them has Chimecho.
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The trainer with Chimecho in Pokemon Emerald is located on Victory Road. When you go to Victory Road there will be two psychics that you will fight. After you fight them one of them will give you Chimecho.
Chimecho is a Pokemon. If you watch Pokemon on TV, you might see James from Team Rocket. He has a Chimecho so be on the lookout.
chimecho when you increase it's happiness and grows a level
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.
The last answer is wrong. At the beginning of chapter 5, after chatot talks to you, go up the little vine-thing. There chimecho will tell you that chimecho assembly is opene! Yay!