All Ultras (Including Shadow Jago)

Maximilian did say that you needed a bunch of supreme victories and ultras for the endings in his video, but the other posts are correct. Max was doing more than required, but the bare minimum is as mentioned before:

Ultra none = 1st ending

Ultra rival (the one before Fulgore) = 2nd ending

Ultra both rival and Fulgore = 3rd ending.

I had no difficulties finding Shadow Jago, I don't think anything matters but no continues (maybe) and ultra your rival. As far as fighting Shadow Jago, just watch Max's video about it.

G'day Bl4ckSh33p!

That particular promotion only comes with one exclusive character: Shadow Jago (as opposed to plain ol' Jago). The other characters can be purchased individually, or in the Combo Breaker pack, or in the Ultra or Pin Ultimate Editions.

You have to unlock all 3 character endings and then complete arcade mode on medium or higher with all supreme victories and an ultra on your rival. If you do that, then you will skip the Fulgore fight and go to Shadow Jago.

Shadow jago was no myth in orignial killer instinct after you beat the arcade unlocking everones unlockable sercet item and costumes whitch was hard as *** that what she said

You go back through beat everyone pull either a ultimate or a fatality on every enemy after that insaid of fighting Eyelord you'll fight shadow jago but insied of the stage shadow temple you fight on the ultra tech shadow mirror level where jago's has to
defeat the ultimate enemy his evil twin

I hope when they update playable Shadow Jago that he has a different Ultra. I hope it has an ending with like 10 fireballs in a stream. That would be sweet.