Where can you find double sword on Final Fantasy Tactics Advance?

Answer 1

Double sword is a skill that aloows a character to wield 2 weapons, one in each hand it can be learned for the Ninja class from the Sword Nosadas which can be found from various quests taken at pubs Equip 2 Nosadas to master the skill at twice the normal rate since mastering the skill requires 999 AP

Answer 2

You receive sword breakers along with random rewards from missions of type 6. These mission are quite late in the game so it may take a while if you're still in the early stages of the game.

Answer 3

You have to make every one join your clan and have your main character LV100