Streets of Rage 3: Everyone VS. Robot Y

Descriptions for all the characters' loops:

Axel
Walk in a specific spot where Robot Y will hopefully stand on the floor for you to quickly punch and grab knee combo it. This will somehow prevent Robot Y from breaking out of combos. Then, standing in Robot Y's position, do his infinite boxing loop (at least that's what I would call it) for the rest of the fight.

Blaze
Jump kick Robot Y from the left side of the room(preferably with the neutral jump kick, as shown in the video) to the center of the room. Standing in the same position, do a suplex from behind. After Robot Y stands back up, it should do a short jump that doubles as a grab. Be sure it lands nearby to the right of you. Robot Y will do either a low kick or a punch, which you avoid by jumping behind it, where you will do another suplex. Repeat this step until the fight ends.

Skate
Do a jump kick by the left side of the room to hit Robot Y to the right. Just as Robot Y hits the floor, start running so that its wake-up attack misses you. If done correctly, you can grab from behind right after dodging the attack and use Skate's overhead throw. Just repeat this step until you win.

Zan
Jump-attack Robot Y like before to get it into position. Before Robot Y wakes up, walk or run past it at the right time for you to dodge the attack like Skate and grab from behind. Then, do the slam on Robot Y, and repeat. If you're unlucky, Robot Y might slip out of the loop for an unknown reason (perhaps timing or something to do with walking?) and hit you with its shoulder.

Roo
This one is rather tricky in terms of positioning and timing. First, jump kick Robot Y from the left side. If you are close enough to Robot Y as it wakes up, it will do a low kick. Jump over that, hit Robot Y with the down air attack, then do a grab attack combo quickly to knock Robot Y down. Like with Axel, this should turn prevent Robot Y from breaking your combos. Run past the wake-up attack (should be a low kick) and do a double-jab infinite. If your positioning is good enough, you can add the back-attack to the infinite. Now you can do the infinite until the boss is defeated.

Shiva
Start it off the same way as Axel, but the next part is using the down air attack to counter the wake-up low kick like Roo. After that hit from the down air attack, use Shiva's infinite punch (the back-attack command) until the boss is defeated.

Ash
Start it like Axel and Shiva, but when you land the punch, do a quick slam (Ash can't really use any other grab move). Next, try to knock down Robot Y (I used the running attack in the video) to position it. You should then run past the wake-up attack like with Skate and Zan and do your primary combo (keep pressing the attack button). I don't think an infinite is easily possible, if at all. Finally, you repeat this step until you defeat the boss.