The Multiversal Pocket Watch is a very powerful item, so powerful that it shouldn't be in the hands of anybody. (this page was made by The Reaping Hopkins)
A long time ago in the multiverse, after Error had destroyed so many AU's, finally Ink!Sans had finally came up with a idea to stop Error from destroying any AU's, so with the help of Time Sans and by using a lot of the determination in the multiverse, they were able to create The Multiversal Pocket Watch, a device that not only could be able to generate unlimited Determination, but it could also be able to reset the entire multiverse to where it began and that the user of it would still remember what happened in the previous "Multiverse Timeline", the reason Ink made this was so that way he could use it to reset the multiverse so that way once Ink was able to, he could prevent Error!Sans from becoming who would become, saving many AUs.
But at the day it was going to be used, a lot of the allies and friends of Ink including Dream and Create came to watch the M.P.W (Multiversal Pocket Watch) in action to see if it works, because if it did, then they found the answer to all of the problems in the multiverse. But unfortunately Dream got a hold of it, then once he saw how much power he had in his hands, the power corrupted him, then he realized that he could use it to reset the multiverse then he could save Nightmare from being corrupted, so then when Ink tried to take the M.P.W back, Dream assaulted him so Ink couldn't take it back, then Ink defeated Dream, then Create got his hands on the M.P.W then just like with Dream, it corrupted him too, but Create then thought that if he used the M.P.W to reset the multiverse, then he could kill Error and prevent the SlayerTale Incident, so then Ink had to fight Create, then Ink won, then finally Ink realized that the M.P.W had corrupted them, so then, in order to prevent anyone else being corrupted by it, he broke it, and just so nobody could fix and use it, he hid it deep away, where nobody could find it.
What can it do
Not only could be able to generate unlimited Determination, but it could also be used to reset the entire multiverse to where it began and that the user of it would still remember what happened in the previous "Multiverse Timeline", so whoever had the M.W.P, would have the power the change the entire multiverse, but it can also corrupt whoever uses it, so be warned.
Even though it looks exactly like a normal pocket watch with a symbol representing the determination used for it on the cover of it, but it can do so much more, with only just a push of a button.