How do you duplicate masterball on Pokemon liquid crystal?

To duplicate a Master Ball in Pokémon Liquid Crystal, you'll need to perform a glitch involving the item storage system. First, deposit the Master Ball into a PC. Then, withdraw it while simultaneously pressing the "A" button to interact with the PC and the "B" button to back out quickly. If done correctly, you should have duplicated the Master Ball in your inventory. Remember that using glitches can corrupt your game, so proceed with caution and save your progress beforehand.