I'd recommend having Doomtrain
junctioned on one of your party members as well. If you don't have
Doomtrain, you have to get the Solomn Ring. You'd have to get like
six of each of something.....I forgot. If ya wanna know, check out
my Guardian Forces Section.
I'd also have the maximum limit
on Full-Lifes, Curagas, Lifes, Curas, and other healing magic as possible.
Have around 15-25 Auras and move your Megaelixers, Elixers, and Remedies
to the top of the list.
PARTY MEMBER PREPARATION
My recommended and favorite party
members would be Squall, Rinoa, and Zell or Quistis. But you choose
your strongest members as the main party for the fight, it's up to
you. ^_^
Have Squall junction Doomtrain,
Diablos, Shiva, Leviathan, and Cactuar. You don't need to use them
in battle, really, but it's nice to have their junctioned status effects.
Once there, Squall SHOULD get the Automatic-Shell. Put that on him
and all magic casted by Ultimecia will be halved. He should also have
a lot of Meltdowns, Ultimas, Deaths, and Flares. Not for magic use,
but for junctioning use ^_^. I didn't make Squall a magic user for
the fight. Whatever you do, DON'T make him a magic user. He needs
to do other things besides casting magic. ^_^ For the menu layout
for him, I'd recommend GF, Recover, and Item. You should also have
the Lion Heart if you have it, but if not, then modify his gunblade
to the strongest.
Have Rinoa or whoever's going
to be your magic user be a magic user. I used Rinoa, so I'll just
use her for the rest of this example. She should junction Eden, Tonberry,
Quezatcol, Pandemona, Carbuncle, or any other GFs that she has a high
compatibility with. Then give her the majority of the healing/recovery
spells and all of the Aura spells that you have. She'll be your main
magic user, and magic it is. I didn't cast a lot of attacking spells,
but I did use a lot of Aura and Full-Life spells. Make sure that Angelo
has learned Shooting Star cuz that's going to be useful in her limit
breaks. For her limit breaks: use Combine Angelo ONLY. You can't afford
having no control of Rinoa. For the menu layout, I'd recommend GF,
Magic, and Revive if you have it.
I made Zell as my third party
member. He should be junctioned with whatever GFs are left. Doesn't
really matter because he's not going to use them for a good use anyway.
Zell should have learned My Final Heaven, his ultimate limit break,
and equipped the Ehrgeiz. If not, then the strongest glove that you
can get for him. Zell's going to be an attacker and Item user. No
need for him to use magic especially when he's not really good at
the magic casting anyway. ^_^ For the menu layout, have GF, and Item.
Get everyone the highest levels
as possible, like HP+60, etc. A good one would be that, Magic+20,
and a high level of defenses.
The
first stage ~Ultimecia: After Ultimecia's "I Hate SeeDs"
speech, she'll choose 3 party members at random. Doesn't matter who,
but make sure at least one character from your main party is in it.
She will cast spells that lock your limit breaks, so use and elixer
or esuna for recovery. Only attack until you have all the members
needed for the final battles.
The
second stage ~ Griever: Okay, you SHOULD have all of your main party
members, right? Well, cast Doomtrain and Eden IMMEDIATELY. This will
bog Griever down. Have somebody who has Cerberus cast that immediately
as well. This will make your magic be casted 2 or 3 times, depending
on your choice. After that, have Rinoa cast Aura on all three party
members. Make Squall do his Renzokuken and whatever special finish
he has at the end. Have Rinoa do her Limit Break, and Zell the same
thing. When your HPs are low, use the Megaelixers and physical attacks
as well as casting other GFs. When the screen begins to move around
like an earthquake, be warned and use your weakest GFs. Griever will
cast his ultimate spell, Shockwave Pulsar. This packs a ton and might
even kill your characters if you don't have a GF who can cover for
you or they're not at 9999 HP. He SHOULD only use Shockwave Pulsar
once, if you're fast enough. If not, be warned for many other Shockwave
Pulsars. 
The
third stage ~ Ultimecia J-Griever: This is a sick and twisted stage.
Ultimecia forcefully junctions with the ultimate Guardian Force and
you'd now have to fight BOTH of them! Cast Auras on Squall and Rinoa
when they run out and attack, attack, attack! DON'T cast any magic
spells because either they get blown away or will not have that much,
if any, effect on them. And DON'T use your GFs. Two little diamond-like
shaped thingies appear with the new form of Ultimecia and will immediately
kill your GFs if you use them during this stage. When you use Renzokuken,
you can see that the Renzokuken has changed accordingly and has a
much more powerful impact than the 2nd stage. You'll know when you're
almost done with this form when the second half falls off and you're
fighting the top half.
The
fourth and final stage ~ Final Ultimecia: This is an even more strange
version than the last stage. You get to see Ultimecia's true form
and fight in the darkness of time. Cast Eden if it's not dead yet,
CONSTANTLY use MegaElixers because she has this spell that makes everybody's
HP go down to ONE, and CONSTANTLY cast Aura and use Limit Breaks throughout
whenever the Aura's effect runs out. If you have the Lion Heart, you
get to see it in full action! (Ha ha, I just like that part....Squall
gets to chop up Ultimecia to pieces!! Besides, it's a kick ass finishing
move!) BE WARNED OF APOCALYPSE!!!! Ultimecia's top half will
draw Apocalypse from her bottom half at some time during the battle.
Whatever you do: DO NOT LET HER CAST APOCALYPSE!!!!! I heed
you of this spell. This spell is evil and horrible and...is evil!!