MY strategy:
-Activating every node on the sphere grid with Yuna,Lulu and Tidus
-Celestial weapons and armours with Auto-Phoenix, Auto-Haste and Stoneproof
-All of your charachters must have Auto-Life casted on them:otherwise three wakizashis in a row will K.O. everyone (Do Auto-life first of all!)
-Do not use Ultima as Yojimbo has a magic counter (not instant) .Whenever U cast spells on him he does Wakizashi when his turn comes.In my game he did up to 4 Wakizashis in each battle,cause I didn't use magic on him.When I did it he did 11!!!
-Blitz Ace is good.
-Quick hit does help!
-DO AIM ALL THE TIME!!!When I did it three times I could hit him doing 99,999 Damage!(Before my party die of course).That means (if U don't count luck) your accuracy is higher than his evasion.
-Summoning Aeons in Overdrive when his gauge is full.
EXTREME DANGER!!!
When U beat him the 2nd time DO NOT continue moving to the cave entrance!!!First go to the Tonberry Area.(Turn to the passage on the right that leads to an area full of souls that light it,the Tonberry Area).If u don't do that u'll finally beat him 4 times instead of 5.As a result, the monk will leave and Tidus will move his head dissapointed.(A battle with Dark Yojimbo is held in the Tonberry Area)
Doing all these...
What for...?
Beating the Dark Aeons... and Penance...
Now that I've done all these I think:"I've wasted so much time to do what?"
But I'm sure that if I hadn't done it I would have tried again and again until I could do it... <img src="/images/graemlins/smile.gif" alt="" />