Whoah, interesting. Would you be able to take some pics of that? I can probably translate its name.
Yeah, sure.
Also, I got the description wrong; the Poké Ball symbol is white, so it
does match with the small sprite. Maybe it is somehow obtainable after all.
Also, some more screenshots of random items I hacked in:
Clear Bell (with description)? Also has the GB Player.
Apricorns and Platinum items
Mystery Egg and the Silver and Rainbow Wings.
Numbered cards? I don't know what number these go up to. But there's a whole lot of them (at least 13).
Description of the first of these cards.
Description of the Pal Park Ball.
And finally:
Shiny Origin Giratina, from my Platinum (Bold 29/x/31/31/31/22) :P
EDIT: There appear to be no new hold items (at least not near where Platinum added the Griseous Orb). No sign of a GS Ball, either.