Karifean got it.

Easily forgotten, easily missed,
It's not required for the main plot.
While here cheer might not be found,
Pretty down place, Gongaga
It is imperative, to keep the right party,
You need Aerith in your party
Or the past might not be unwound.
Otherwise no trigger.

Your turn Karifean!

edit: Win count so far:

Bubba - 6
Metagloria - 4
FFIX Choco boy - 2
gruntace101 - 2
AK - 2
Jinx - 1
Loony BoB - 1
Chionos - 1
Sephex - 1
Karifean - 1