I finally got the trophy using iamriddles technique (tx to him

):
Quote:
Originally Posted by iamriddle
we used r2 and square ... this makes it so sanchez doesn't run at you but you still get the lag glitch ... at the start of the match, just use cro cop to run at sanchez and do a spinning back punch or superman punch
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My partner faked punches, I ran at him, supermanpunched him, he got knocked out in like 5 or 6 seconds, trophy popped up. FlashKO is very random you need to try many times.
I got FlashKO trophy after 50 of so tries, and here is what I've found :
1/ doesn't work with created fighters (I did TONS of flashkos, no trophy)
2/ you don't need to delete your partner from your friendslist
3/ flash ko must be done very quickly (I did flashkos late in the 1st round, no trophy)
TIP : if your partner has an auto-fire pad, tell him to put triangle & r2 on auto
EDIT : Squeek111 told me it should be possible with CAF.