I think it currently does nothing, I didn't notice any changes / places to use it myself. Glad you found the item though!

ah no i did find it, it was from the gauntlet! i'm still not sure what the item i bought does though, the "mysterious stone" i read the description and cant really figure out if its made any real change

Hey OWOBruce,
I think the item you're talking about is either the one you get from defeating the final boss (of the main game) or the one you get from beating the gauntlet (also in the main game). If it's not one of those, do let me know so I can open the game up and check it out for sure.

how do you get the item to buy the 50000000 $ thing from the NPC? i've killed all 3 new bosses

Hey again Greenegarth
I've just updated the guide. Thanks for the info, friend

yeah just got them, u kill the tree new bosses (one is in a island crossing the sea) and u get the last achievement from buying the 50000000 cost item from the first npc u find on the island

Hey Greenegarth
It seems that the cursed and lost captain achievements are new. Once I get those achievements, I'll make sure to update the guide, but I imagine that you just find the two bosses and beat 'em.

how does one get the cursed capitan and lost capitan achivements?

Hey GL1TCH3D
In the pause menu, you might notice a tab called "Pokedex", which lists all the enemies that you have found. Until you have found and defeated the enemy, it won't list its name, where to find them, or even what entry it is. If you are missing an entry and you don't know what it could be, I recommend that you 1) make sure that the enemy isn't one of the three "secret" enemies (which I listed as a spoiler in my previous comment to Krokar), 2) make sure that the enemy isn't in the final gauntlet, and finally 3) go through every level again and make sure to explore and kill everything you find.

Is there a list of enemies and where to find them?