All pokemon cheats on the 3ds using cheakpoint work by activating the code in the cheat menu then pressing the hot keys then deactivate before you do anything. Attempt to play with cheats active from experience with omega ruby, y, and dusk they crash the system before obtaining the desired result. Some codes I haven't figured like the encounter code for y/x but I'm assuming it's similar to the ones in the ds generation that you drop a curtain pokeball to get the desired species of pokemon you look to encounter. Hope it helps.
