I went to the Bulbapedia page for Metronome because I had another question about the item, so I looked there. Afterwards I saw a notice reading the following: "Does the counter only increase if the move is used while the Pokémon holds the Metronome? Is the counter reset if the Pokémon's Metronome is stolen? You can discuss this on the talk page."
There was no answer on the talk page and that made me curious, what happens if the Metronome is stolen/replaced/etc?
I'm talking about the item if I wasn't clear enough.
