I feel like an Item that doesn’t work just shouldn’t have been obtainable maybe, but If we want to keep the effect similar to the main series effect how about; when held by anyone on the team, It Increases the spawn rate by a little bit. I feel like In most cases this Isn’t overpowered, due to the number of held Items worth using, assuming It can’t be stacked from party members also holding It or holding multiple yourself even. Like a sort of cap to how much can be added to the default spawn rate of the dungeon. Adding the effect of durability and having an NPC for It sounds extra unless that was built Into something more for a much bigger range of Items.
Ok! As simple like this! It’s a Musical Instrument! Let’s make the NPC in Harmonic Tower Entrace Map!
People will complain about It being In such a far way spot that requires two HM moves. On another note though, the flute could just be turned Into an Item that plays music. What the effect should be might depend on what’s planned for the other 4 flutes If anything, since there’s more than just the white one.
As seen from the link, the Black Flute basically does the opposite of the White Flute, and the other three cure status conditions. Blue cures sleep, red cures Infatuation, and yellow cures confusion. Again, If we’re going with something akin to their effects In the main series, well, I see nothing wrong with them for PMU In the case of the status condition ones. Whether they’d be overpowered or not depends on how early you can get them, but In any case most people have their family Items or gems, or use Safeguard anyway. Even so, If you don’t have any of those, there’s always Refresh and etc. The aforementioned statuses ( and most ) only tend to be a problem when you’re surrounded, and If you’re surrounded I kind of doubt you’d be able to both cure yourself and execute moves fast enough In that span of time In order to save yourself.
Regardless of the color of the flute I think when It comes down to It they’re mostly collector’s Items. In the case of the status flutes, If they were able to cure their respective status, It would be a cool added bonus.