it will be a different colour from usual and when you first go into battle there will be a ring of sparkles around it. Also, you can check by going to the Pokemon you want to check to see if its shiny and go to its summary. If there is a little red star next to the Pokemon, then it is shiny.
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What do you mean how do you make a shiny Pokemon stay shiny if you get a shiny Pokemon it stays shiny ok!
No
there is non
By cheating.
No matter what Pokemon it is and if it is shiny it will stay shiny if you trade it or migrate it, trust me i know i traded my shiny banette to Pokemon xd and its still shiny.