Where does it say check cards in Pokemon

After your done mystery gift, you must make sure it's successful.to check if it worked, go back to mystery gift and press check cards. If it worked, go to any pokemart, except the Pokemon league and a green man will appear. Talk to him. Make sure your bag isn't full if it's an item, if it's a Pokemon, example pikachu from Pokemon battle revolution, make sure you have an empty space in your party. PS: your only aloud 3 mystery gift cards at a time, you may discard them, you won't lose anything so it's safe. It's used so that Nintendo or anybody in the events made sure that your not cheating.