I got HM Dive from Wiscash, but I lost it. Now when I go to the Solar Cave Flor 10 all there is in the room is a Link Cable. Its not in my Toolbox, or Kangaskahn Storage, so where is it?!
Check ALL your pokemon in their friend areas and see if any of them are holding it because it has to be somewhere, It cant be lost.
I had a moment like that in emerald when i thought i lost my exp share and i looked everywhere and then it was on one of my pokemon in the daycare, but i suppose thats a bit different to mysterious dungeon
Ya, I lost surf twice, but each tiem is was back in solar cave. Go to your list of friends and just go down the list viewing each ones summary, it says on the firts page of it what item they're holding (If they're holding one) I did it and had no idea I had given all these tiems to these Pokemon I never use