Beating those OH so cheap last bosses

I remember two games where I could NOT beat the last boss on medium difficulty: SFiii3 and GGx#R…Now I’m trying to destroy mizuchi in ngbc, what’s the best way to get around the cheapness? Practice mode at highest diffuculty for hours on end?

I feel like this is a noob questions since: Any amazing player can destroy computer opponents easily? Another assumption on my part.

Most often they can, but many times they just mastered the AI flaws and exploit them so as not to die while waiting for a challenge. CPU often plays by different rules, such as not charging for charge moves and reading inputs so they can do shit like first-frame-projectile-jump-in combos.