In response to cernios GBA version of the ultimate showdown, i've decided to give a whirl at doing a ps2/psx one...(I wont let you get ahead of me Cern!!)

To be sung to the tune of the ultimate showdown which can be viewed here:

Ol sephiroth was floating around
Gathering sins and materia rounds,
when suddenly Ratchet burst from a beam
and shot sephiroth with Ryhno 3

Sephiroth got pissed and began to attack
but didnt expect to be blocked by Jak,
Who proceeded to attack with dark eco skillz
When Sly cooper jumped in from a window sill,

Then he started beating up the whacko Jak
when they both got flattened by ratchet's kick
But before he could make it back to the pheonix
Tidus popped out of the farplane,

Took an ultima weapon out from inside his pants,
sliced ratchet to bits,
with a shaka shak shak,
But he ran out of mp and he ran away,
Cos Leon S Kenny came to save the day.

(chorus)
This is the PS-S showdown
(of ultimate destiny)
Good guys, Bad Guys and explosions,
As far as smart gamers could see*,
And only one will survive,
Well I know who it will be,
This is the ultimate showdown,
(of ultimate destiny)

Sephiroth took a slice out of Leon S Kenny
Like a dumb kid took a bite of a penny,
When Jak came back
Covered in a tire track
And Kratos jumped out and landed on his back.

Ratchet was injured and trying to get steady
when tidus came back with an normal machete
But suddenly something hit his head and he fell
Sora conked his head with a shell.

Then he saw sephiroth creeping up from behind
And he reached for his keyblade which he just couldn't find
Cos ratchet stole it and he swung and he missed,
And Kratos broke it with his fist.
Then he jumped in the air
and he did a somesault
While Tidus went and tried to pole vault,
Onto Leon s kenny
but they collided in the air
And they both got hit by a tomb raider stare

(chorus)

Demons sang out,
in a cackling display,
Up from hell,
Ascended Dante,
Who delivered a shot,
Which could banish souls,
Into the skull,
of Sora the saviour,
who fell over on the ground,
Dead and unmoving
As ratchet panicked
And tried to go through him,
But dante stopped him
in his tracks
and he impaled ratchets body,
with a giant thumbtack.

Sonic the blue and shadow the black,
And foxhounds legendary solid snake,
And Crash the bandicootie
And raiden the sissy
And Squall Leonheart
and toni Leone
Kazuma Jin
The viewtiful joe
Riku
And Sub Zero
Ashe
Tala
Every single .hacker
Dragon of Dojima
And Great lord Kain
Sam, Spyro, Nightmare and Mileena

All came out of nowhere lightning fast
and they kicked Dante
and his demon ass
It was the bloodiest battle
that sony ever saw
the civillians looking on in total awe

The fight rage on for decade or two
Many lives were claimed
All of them flushed down the loo,
but the champion stood,
The rest saw their better,
Haseo with a bloodstained dagger.

(chorus)

END

I know it doesn't excactly rhyme, and some characters metioned aren't exclusive to the ps2 but if you've got a problem with that then *censored*