Instant one hit kill:

To kill any enemy including any boss in one hit (including the final boss)
you need yojimbo. Get lots of money. and yojimbo in full overdirve.
pay him all your money you have.
and he will use an attack which will chop the enemy in half. this atack always work on anything and i mean anything.

What is with seymour:

He is just this strange Guado guy who ends up Going NUTS.
All he wants to do is become the new sin.
Well why doesnt he just float over to sin and go inside of his brain.
because then he will become the controller of sin.
i think he fell out of the wrong side of the emergency bed at birth.
LOL.

LOL.

Well what is with him he broke his brain when meeting yuna.

too much for him.

LOL.

The only problem with your "one hit kill" is that Zanmato actually has 4 different levels. Most bosses are immune to all but level 4 Zanmato. Also, half the time you pay him, no matter how much or whether he is in overdrive, he will just do one of the other 3 attacks.

I find this as a lame shot at making a funny. *yawn*

Hmm...are there any other Half-Guado in FFX? If there arn't we might be able to put at least some of the blame for his madness on his mixed bloodline.

How would all the mechanisms work when his parents were in bed?
I don't Guados have the same objects required

I was just going through Omega Ruins, and Ultima Weapon came up (not wanting to battle), used Yojimbo and he did Zanmato :D. (paid him 666 gil lol)

Then against Jecht i used him, got Zanmato also. (paid him about 15,000 gil). Was in his second form, first Aeon i used (just expecting it to do some damage). Lucky me.

As for Seymour i really enjoyed the character, the voice really suited him, eg. Where you fight him for the last time.

Hmm...are there any other Half-Guado in FFX? If there arn't we might be able to put at least some of the blame for his madness on his mixed bloodline.

There was a half-human/ half-al bhed.
Forgot who though! olol

Anyway: what a silly person.

lol zanmato is how i beat some of the dark aeons a nooby way i know but thats what i did :)

Never quite used Yojimbo's full power, so I never unleashed his Zanmato move.
I usually just paid him a penny for 9999 damage, but that's about it.
I usually used Bahamut's slash for the over 20000 damage.
So yes, I didn't go too deep into the Sphere grid.

As for Seymour, his voice actor fit him well, his plan made no sense and he was just another psychopath to me, which is cool.
Though his furry belly freaked me out.

yea yuna is a half albhed

a good tip: before a boss battle prep all your Aeon overdrives and then use them all 1 by 1 until the boss dies, this makes the game piss easy.
you could also use them a scrificial lambs for powerful attacks as you start doing later on mwahahahaha!
yojimbos rating can become lvl 5 if you payd him 1/4 more than his asking price when you recruit him and when you dont let him die. If he uses diagoro reset the game cos that drops his friendship rating badly, that means he isnt happy. if he does wakizashi off the bat when you summon him or does free attacks his friendship level 4+. All this info was picked off of my official ff 10 guide so you can rely on this.