I found this on the web and thought it might be possible. Anyway it's an interesting theory
PlayStation RPG 1997 UK (PAL)
PLOT ANALYSIS (version 1.8) 09/01/2003
Author - falsehead (Sophie Cheshire). Contact me at falsehead@aol.com
THE INCOMPLETE GAME THEORY - contributed by RTSmith005
First I will present the evidence that can be found in the game
and related to the game.
1) The presence of Aeris's ghost in her church is a very small plot point in
the game. In fact, it's barely discussed by any one in the game itself. Why
else would it be in the game. A nostalgic moment? Perhaps.
2) Before the final battle there is an extra ledge that no one is standing on.
3) For the battle against Bizarro-Sephiroth, if you are strong enough to form
three parties, then one party has only two characters. Each party should have
three members...
4) Throughout the game Cloud is in situations in which he must pick Aeris over
Tifa or show that he is an uncaring or a caring guy. However, after Aeris's
death, this entire point is dropped. Considering the number of decisions you
are forced to make (around twenty some) you would think it would have more
bearing than who you get to date...
5) In the Japanese version, why does Aeris speak at certain points after you
use the GameShark to get her back? Why does she only have it in certain spots?
6) Aeris's best weapon has only seven Materia holders and it can gain AP, while
EVERYONE else's best weapon has eight linked slots and gains no AP.
7) Aeris's Umbrella has a higher Attack Power than her best weapon, the
Princess Guard, whereas everyone else's best weapon has a higher Attack Power
than all of their other weapons.
8) When you get Aeris's fourth limit break she has most likely already died.
If you actually do what you need to do to get it before she dies you waste vast
amounts of time (it took me three extra hours of getting her limit breaks up).
The point is that if you get it before she dies, it doesn't seem like you
should have it yet.
9) Right before the pillar steps in the Forgotten City before Aeris dies there
is doorway in the background. If you look at the patterns on the pillar, the
doorway is somewhat similar but markedly different. Programmers usually don't
put extra stuff like that in a game; it's a waste of time and effort. There is
no way to reach the door.
10) If you look at the floor before Cloud is trying to kill Aeris, there is a
spiral staircase leading downward. If you think about the way the City is
shaped it should be the reflection of the stairs above, but if you think on how
the glass around Aeris is shaped, it physically couldn't be so...
11) In the game manual there are FMV drawings of the characters. Every
character's drawing except Aeris (she is looking at the highwind you see it
where disc 1 is in) actually occurs in the game, or could realistically occur.
Aeris's cannot, as she wasn't with Cloud when he first saw the Highwind on the
first trip to Junon. She had already died when Barret and Tifa made their
escape on the Highwind later. In the picture she also dressed in white, and the
entire game she dressed in red...
12) The strongest empirical evidence for this lies in a conversation Cloud has
with Tifa during on the bridge of the Highwind... Tifa:I wonder what Aeris
felt... when she was on that Altar... Cloud: I'm sure she wanted to give her
life for the planet... Tifa: Really? I wonder? I don't think that's it at all.
I think she didn't think she would die at all, but that she planned on coming
back all along. She always used to talk about the "Next Time". She talked about
the future more than any of us'. This is very, very suspect, as anyone can see.
The entire game is ruined, in my opinion, by the loss of Aeris, and the death
of hope and joy. Many argue her death insured the player's hatred of Sephiroth.
Even if she were to be theoretically resurrected, I would still hate Sephiroth.
In my opinion, Square should re-release the game with her resurrection, and a
better ending, one worthy of a Final Fantasy game. Would it make her death
meaningless? Yes, it would, her sacrifice would be null and void and hollow.
But her death makes the game meaningless... Judging by the number of people who
desperately want to resurrect her, I think Square would profit financially from
such a decision. A game, which was already great, could be made truly perfect.
But somehow, I don't think this will ever happen. - XxRTSmithxX.......(thx for
letting me share this falsehead)"
#5 above sounds the most convincing as in order for aeris to speak at those points someone must be making the assumption that she would be around at those points. Unfotunately I don't have a gameshark so I can't really check into it.