Viewtiful Joe Scratch!
This game is titled Viewtiful Joe Double Trouble in North America, Europe, and Australia and Viewtiful Joe Scratch! in Japan.
Successfully complete single player mode under the
Adults difficulty setting.
One technique that is particularly helpful against
most of the Boss stages is to use the Slide attack. Use Slow +
Slide repeatedly. This does a decent amount of damage in a short
time. You can hit the Boss four to eight times if you are fast
enough, while the Slow adds more damage to each attack.
Finish flip in Normal mode
When your VFX bar's first container is half full, use
Slow Motion (hold L) and double jump. If timed correctly,
you will do half the flip in Hero mode and half in Normal mode.
If you want it to look even better, use Slow Motion and Double
Jump just as Joe transforms into Hero mode. If timed correctly
you will do your flip with the transformation glow around you.
Strategy guides from GameFAQs