:-( Hiya peeps ive just got omnilash and im on disc 2 do i have to be on disc 3?
i have all the other limits..when i press omnilash on cloud it ses "im not sure but.."
PLZ HELP

you have to get all of his other overdrives, Lvl 1 2 3 etc. You have to keep using the highest overdrive you currently have over and over again. You have to use it a certain amount of times to get his next one. Not quite sure how many.

Braver - You start with this one.
Cross Slash - Use Braver 8 times.
Blade Beam - Kill over 80 creatures with Cloud.
Climhazzard - Use Blade Beam 7 times.
Meteorain - Kill another 80 creatures (160 total) with Cloud.
Finishing Touch - Use Meteorain 6 times.
After that you should be able to learn Omnislash. If not try to kill another 80 creatures with Cloud. If that doesn't help - guess you're out of luck...

I thought you got omnislash from the Battle Arena?