How could I make a Creature that can Deactivate your invisibility and lower negate chameleon when the player would be in a "viewable" area of this creature. Aka if it "sees" you, it disables your ability to hide. ?

I mean what type of script would I have to run on this creature to do that?

Just have the creature cast a AOE On Touch spell on itself or have another object/creature do it -> that runs a script checking for if any actors around are effected by Chamo, Invis or Stealth and remove the effects or just tell the creature to attack the player even Invised, Chamoed or Stealthed creatures told to startcombat will not all will find their targets but most will.