Lagging Tail disappeared after bossfight

[Lvgia]

I was fighting against Raikou guardian and as usual i used switcheroo on my cottonee to trade my lagging tail against his item to make that poke slower.
After i defeated him, i realized that my lagging tail was gone. I checked my whole box for items, my back and my party but it just disappeared.
Hope this bug gets fixed and is there any ways to get my item refunded? (im kinda broke)  

[Norex]

Could it be that you got into a wild encounter before and tricked it away on accident?

[Lvgia]

9 hours ago, Norex said:

Could it be that you got into a wild encounter before and tricked it away on accident?

No i did not use switcheroo myself on a wild encounter. Neither did i encounter any pokemon that could take the item from me in any way.