Quote Originally Posted by Hawkeye
Alright, so I have both of them, now I gotta get 76k battle points?

Jesus Christ
As one can never have more than 65,000 BP at one time, this would be impossible.

If you've already "purchased" W-Summon (64,000 BP) and Omnislash (32,000 BP, or 51,200 BP if obtained on Disc 1), you'll also need the Ultima Weapon in order to engage in the special battle.