Sigh, my code isn't working in FireRed

[NickGirdy55]

This is it

#org 0x3B9820
hidesprite 0x11
setflag 0x1200
end

The flag is in the Person ID number, the sprite number is the person event number (both Oak and the Aide that gives you the running shows are set with their person event number so I know I've got it right).

All I want is for Leaf to be hidden until another script calls for her to show up, but every time I tweak something and reload the ROM she's still there, blocking the second block in where I put her. Having the script offset in the offset area of the people event (which isn't a thing for other hidden sprites) doesn't make a difference, she's visible either way.

I've totally had scripts like this before in previous attempts at ROM hacking, so I have no freaking clue why this would be screwing up! Please help me before I kill people!

Not really though. Don't worry.