In the yeti boxing bonus level When you start the first round of the 3 round fight pause the game and exit the area, then come back in. It will skip to round 2. Repeat the exploit again and it will skip you to round 3. You’ll still have to fight the yeti, all I did was hit him once and then avoid his attacks.

Is this exploit known about? If it is, is it used in 117 percent speed runs? If not why?

I was able able to do this on both psp and a PSone