Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
No to all of them, except Arceus can definitely knock off other Pokemon's Plates.
Now I remember why I used `target.getItem()` instead of `target.getItem(source)` in Knock Off! It had nothing to do with Sticky Hold at all, it was because using `source` made it so knocking off the user's species-specific item from another Pokemon failed for some reason. Well then.
Now I remember why I used `target.getItem()` instead of `target.getItem(source)` in Knock Off! It had nothing to do with Sticky Hold at all, it was because using `source` made it so knocking off the user's species-specific item from another Pokemon failed for some reason. Well then.