Iron Man is not found in the Battle Square.
Iron Man only appears in battle ID 225.
That means there is one field where he can be found, and one field only.
Hmmm... not quite. Right conclusion, wrong points.
The Battle ID is 900, which is found in file 225. Each file has 4 IDs. Secondly, a battle ID used for Battle Square does not have to have the Battle Square background - all it needs is the data for the next battle in the series, and even that doesn't matter for the final battle.
Hell Rider VR2, as an example, only has one Battle ID: 70. Yet it is found in both Battle Square and on the Junon Wastelands.
Iron Man doesn't appear in the Battle Square because none of the code leads to its Battle ID. That's all the proof you need.
mirex, ever since a year ago I've been doing basically everything I see possible on FF7 including getting as many as possible of each item. The W-Item trick is allowed, but not a gameshark or dexdrive. I already finished getting 255 on all of the 8 final characters' stats entirely independent of their weapon bonuses, which I obtained from Kao Megura's FAQ... Basically I'm obsessive-compulsive. The toughest items to max will be the chocobo racing ones that only appear as prizes like once per half hour.
I'm wondering what you'll do when you find out it's possible (if insanely difficult) to max out each character's HP and MP, including getting Barret's HP to 9999 naturally ^_^;