Yes you can evolve multiple Pokemon at the same time. The requirements that would be needed is multiple proper evolution stones to evolve the desired Pokemon. Evolutionary stones can be found spread throughout certain areas of the game.
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Audino does not evolve at any time in either game.
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.
Yes juts level it 1 more time and it will evolve :)
Budew is a hippie pokemon, and evolves with freindship. Personally I think the whole "evolve with friendship" is BS! Pokemon is just a waste of my f***in time!
Cottonee evolves by sun stone. If you have a sun stone you can evolve it at any time.