Also, I've seen to have lost my Aerih plushie (or at least the one given by the old lady on Tchurro town) so... That one sucks a bit more...
Are you playing using an old save?
Yes
I can't verify any report using old saves since it can cause lots of unexpected bugs
i had this too, aerih stacked with the mushroom plushie when i received it (like SP and antidote)