I think I found a glitch, on the Master Squid, since if you deplete his health once you must do it again to beat him, when I lost once when I fought him again he was already red, (because he turns red at second phase).
For those who don't already know, once you've beaten a boss on the wanted list of a town, (and this may not work on some bosses) you can return to the spot of where you defeated it, and it will still be there, I do not know about what happens if you beat it on hard mode, but it's still gonna be there if you've already beaten it. P.S. you will get the same rewards.
Step 1: start and play the game a bit then close. Step 2: set your O.S. system time to the year 2075 or something. Step 3: Reset game to gain angels. Step 4: Go to step 1.
;)