Like trading in-game not over wireless communications or wifi. Like the guy in Undella who trades a Munchlax for a Cinccino - will the Munchlax have any EVs??
No they do not have EVs but they do have specific IVs in most cases. In Unova all the in-game traded Pokemon have 20 IVs in each stat except one stat that is 31 (perfect). Useful for breeding! Yo can see the exact IVs here.
They will not have Ev's but will have set IV's.