Thanks again, I was doing exactly what you were saying. :) I had x255 Lemonades and I stored them on PC as well, which caused there to be an apparently infinite stack of x255 Lemonades and a glitchy PC. I was also unable to retrieve the Lemonades and W SM, but like I said earlier, luckily I hadn't saved and everything is back to normal now. I tried depositing and withdrawing W SM and it works like a charm.
So W SM is completely safe to be kept on PC when not using it? I find it to be somewhat dangerous in the bag, as if I'm not mistaken, it can and will wipe out the entire save permanently when used with the wrong set-up? (Items in bag and wrong active PC box.) Also, is it safe to store non-x255 items to your PC? I would find it convenient to keep the x201 Revives, x43 Burn Heals, x53 Ice Heals for the item duping trick and x134 X Accuracys, x209 Carbos', x119 Poké Balls, x201, Fresh Waters and a single Lemonade for the max DV/EV trick.