Final Fantasy X Glitches

Invisible Characters
Okay this will only work for one character at a time and only for one battle, but it will work. Go to Bikanel Island, or the calm lands and fight against a giant worm. Attack for a bit and eventually it will swallow someone. Now have one of your characters use sentinal and another attack it. Eventually it will spit up the character it swallowed. When that happens your charater using sentinal will take the hit and the one spit up will now be invisible for the battle. To regain visibility of that person just summon an aeon. Now go have fun being invisible.