Earthquake
Pokemon expert
Isn't Jenova doing a Sephiroth personification back then, too? I am pretty sure that his body is all the time in that crater in the north. All the other times it is Jenova controlled from him, while also taking his form.
In flashback yes, but it is just a flashback.
You are at the crater in the north when you hand over the black materia, when Sephiroth is in that kind of lifestream/mako cocoon.