Yes I have to agree, Emerald and Ruby weapons are extremely difficult to defeat.
It took me like 50 times with constant materia and strategy changes to actually beat Emerald weapon, he was tough!, and when he uses "Air Tam Storm" which instantly annihilates everyone (unless it misses.)
I still have yet to defeat Ruby weapon, now this battle--my god

--how on earth am I supposed to do this?, he sucks up two of your characters at the beginning of battle and his basic attack does like 6000, not to mention his tentacles are trying to kill you too. Anyone have any strategies for beating him?