Well Here is everything about
Effect: Causes Thief and Covet to fail when used on holder. Causes Trick and Switcheroo to fail when used by or on the holder. Causes Fling to fail when used by holder. Pokémon holding this cannot be placed in the PC.
Description:Stationery featuring a print of a blue world underwater. Let a Pokémon hold it for delivery.
I Look every were for a answer Gengar this is all I came up with ;)
Also I see the three bubbles your talking about maybe when the Pokemon Holds the mail for a while the bubbles just transform's into the Pokemon ?
I love Weird things ¯(°_o)/¯