irst there is a way to revive aeries but only on the jap version. if you got that go to near where aeries lives and talk to the "ill" guy in the pipe (hes apparantly one of the ancients) and hell die in order to revive aeries. voila
Just to clear that up...in NO version of FFVII can you revive Aerith. It was never a part of the game, not even in the Japanese version (ironically, the version we got was actually superior to the original Japanese release, despite all the silly rumours of Jap-exclusive resurrections).