Definetely.
Yes.
Yes.
Yes.
Yes.
Yes.
Yes it could but not in one hit.
No because there are 13 Knights verses one Eden you can only guess what happens to Eden!
Absolutely, as soon as they begin there ULTIMATE END move ultimecia would be dead.
Knights of round
In a hypothetical battle, the Knights of the Round from Final Fantasy VII would likely have the advantage over Orphan from Final Fantasy XIII. The Knights are powerful summon creatures with high damage output and various elemental attacks, while Orphan, despite being a formidable foe, has specific weaknesses that can be exploited. Additionally, the sheer number of Knights summoned would overwhelm Orphan's defenses. Ultimately, while both are strong, the Knights of the Round possess the potential to defeat Orphan in a direct confrontation.
Yes, nothing else will do. You cannot reach the island in which it is kept any other way. However you can defeat Emerald Weapon and trade the Earth Harp you receive to a man in Kalm, and he will give you three Master Materia, the summon one will allow you to cast Knights of the Round, though you won't have a separate Knights of the Round materia.
no