"This move works even if the user has no item, but will fail if the user or target has had an item Knocked Off." Read a little more. Don't know, maybe this was written later, but read through once more.
Just found out that mono with the ability magic guard are immune to the full paralysis condition. I noticed this when using MG clef on cart and not getting para'd once in 50 or so tries, and I did research online and saw yt user: chuggaaconroy state something about this as well as this specific bulbapedia article. If this was already stated then sorry, but I just wanted to point this out just in case it was not previously known.
edit: sorry if 4 year bump is completely uneeded lol.
Don't know if this was known, but I was fighting a Wild Ratata and it got confused, and then when it hit it self with confusion, it said that the chillian berry weakened tail whip's damage.
Perhaps berrys can reduce the damage done from confusion damage if the inteneded attack was a type that a resist berry would lower? (I.e. Confused Shuca Heatran using Earth Power)