Ew no. I do not condone the use of outside programs like Gameshark and wish that Nintendo and TPC had won that damned lawsuit against them so the evil, vile thing never existed.
Digital versions of XY can use smogon's program called Keysav to back up the save file and view shiny values of your eggs. If you bought the physical version, you need to buy the new 3DS Action Replay (called the Powersave) to first back up your file.