RNG without codes

The game decides nature, IVs and shininess with a number generator that depends on timing. Hit the right moment and you choose what you get.

1. Pick the initial seed. It's set when you press the button on the title screen, the one with PRESS START. The RNG page shows the known Switch seeds and the timing for each one.
2. Find your target. Search for the Pokémon you want and write down the frame advance it comes out on.
3. Time it. Use the page's timer: it beeps when it's time to press A at PRESS START, at CONTINUE and when it's time to interact with the Pokémon.
4. Adjust. Enter what you got. The site figures out which seed and frame advance you hit and corrects the timer for your next attempt.