I would advise you to RNG Quaza on Heart Gold or Soul Silver instead , or even just soft reset for good IVs in ORAS instead . To get a good Rayquayza on Emerald , you will need to leave your game on for literally hundreds of hours . Emerald RNG is fairly simple but very difficult . Legendaries in Emerald are a method 1 encounter with your seed as 0 or null . So when you open RNG reporter it defaults to this , you would just fill out what IVs and nature you ' re looking for and click generate . I did a quick search though . First 5 IV Jolly Rayquaza is frame # rrn . This would mean leaving your game on for over 3048 hours . The only viable rng method in Emerald on a retail cart is breeding . To answer your question though , for just good IVs , you don ' t need to know your secret id .