sirDonovan
Wonder
It's a new mechanic in Gen 6, if you faint while using it, then the item will not be removed.I'm not sure if this was brought to attention, but I didn't see it in the OP; Knock Off doesn't remove the opponent's item if the user faints. For example: My Landorus-T uses Knock Off on a Ferrothorn who is holding a Rocky Helmet. My Lando faints because of all the damage done by Iron Barbs and the Rocky Helmet, but it doesn't remove the item from Ferro. If this mechanic (if I can call it that) works the same if one would faint trying to remove hazards, disregard this. Or at least it should be mentioned in the OP.
I just tested this and it worked for me. I think you should delete the team from your Teambuilder and then add it again by importing the text from that pastebin.http://prntscr.com/2zeo4n http://pastebin.com/q7d9G3KW
how is it invalid? i was challenging someone on ou mono, but i got a pop up. i'm not using custom client