Final Fantasy X HD Remaster - Baaj Temple - Onion Knight
The Onion Knight is outside Baaj Temple and is Lulu's Celestial Weapon. To get it swim to the South area of the mini-map and into an area where the screen changes. Spam the X button because no part of the chest is visible.
Like all other Celestial Weapons, the Onion Knight is useless until it's powered up. Since the Venus Sigil is the hardest item to get in the entire game you might want to consider making a custom weapon for Lulu.
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