Pokemon Scarlet and Violet geniuses discover exploit that can generate infinite Master Balls and other rare items just by altering the Nintendo Switch clock

gamesradar.com:

Genius Pokemon players have somehow uncovered an RNG exploit in Scarlet and Violet that allows you to generate infinite rare items – including Master Balls – just by changing the date and time on your Nintendo Switch. 

In case you were unfamiliar, Pokemon Scarlet and Violet's Indigo Disk DLC added the Item Printer – a handy feature which serves as an elaborate gacha machine which can produce things such as Pokeballs, evolution stones, and held items in exchange for materials and Blueberry Points. While this essentially already allowed players to acquire infinite amounts of the items available, the best ones are very rare, so there was never a guarantee you'd get many of what you wanted. However, this exploit changes that. 

As highlighted by @Sibuna_Switch on Twitter, the RNG of the Item Printer is set based on the time and date on your Nintendo Switch. In simple terms, specific outcomes (such as generating five Master Balls at once) are guaranteed to occur at certain times – or seeds – so if you know what to change your system clock to after loading up your game, you can repeat the process as many times as you like. The community has been rallying to discover which of these seeds are worth using, and plenty have already been pulled together. In fact, Twitter user @Kaphotics has even published a calculation tool to help discover seeds based on the items you want. 

So, assuming that you have a seed to aim for, how do you actually pull this off? As outlined by @Sibuna_Switch, before getting started, you'll want to make sure your Item Printer is upgraded to at least Ultra if you want to generate Pokeballs, or Master for regular items. Then, before proceeding to the item seeds you want to use, you'll want to trigger a ball or item bonus – there are seeds for guaranteeing these, too. 

The key to this manip is to ensure that once you click "I want to print," the game fades to black on the target second.You should calibrate to find out if you need to click 1 or 2 seconds