FinalFantasy12, I wouldn't hold your breath on this means of getting a Zodiac Spear. There is only a 1/1000 chance of the Chest appearing with the spear inside of it. It is a total luck situation and generally requires way to many hours to obtain one from the chest let alone multiples from that chest. There is really no need for such a powerful weapon either. Every bad guy in the game can be taken down with out it.
If you truly want one the best and easiest method is Nechrol method that FFking pointed out.
Seeing I am lazy I am just going to source the chests you don't want to open and throw it in a spoiler tag.
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