Yeah what does Scout mean.
It means to throw out a Pokemon in order to see what Pokemon the opponent has, this is not so useful in this generation as you are told what Pokemon the opponent has before you battle. But you can still use it to see the functions of their Pokemon. Scouts usually have U-turn or Volt-switch and are fast. Also having a status move on a Scout can be very useful, using T-wave then U-turn/Volt-switch can repeating can be quite annoying to say the least.