Gau's Rage 75%

Yes, if you know ASM, you can do it by rewriting this section of code, which is basically a coinflip.

Code:

C2/0600: 20 53 4B     JSR $4B53      (random: 0 or 1 in Carry flag)
C2/0603: C2 30        REP #$30
C2/0605: 2A           ROL
C2/0606: AA           TAX            (X: 0 or 1)
C2/0607: E2 20        SEP #$20       (Set 8-bit Accumulator)
C2/0609: BF 00 46 CF  LDA $CF4600,X  (load Rage move)
C2/060D: 28           PLP
C2/060E: FA           PLX
C2/060F: 60           RTS