Not "supposed" to exist? Not canon?
Well if the game only should go by canon, over half the fights in the game wouldn't exist, and the fight pairings that ARE available must be performed a very exact way.
I mean, a Frieza/Goten fight isn't supposed to exist, but it can happen in the game.
Oh, and wtf is a SSJ? There's no J in "Saiyan"...