im a boxer and a boxing and mma enthusiast , some moves are from irl boxing but exagerated and some are from hajime no ippo (anime) so, these are my thoughts on wonderboy moveset:
stomp & hook is probably sawamura sabotaging ippo by stepping on his feet not letting him get distance or when him maked ippo fall with his feet.
Pull counter is mayweather pull counter but exagerated, mayweather only pulls his upper body back and counter punching, while wonderboy moves all his body and pulling it back with a strong counter.
flicker attack could be, 1 Thomas Hearns irl and mashiba in hajime no ippo flicker jabs by lowering the hand and doing quick and strong jabs with almost no body movement for it to be less probably to get countered or 2 hayami shotgun jabs, quick jabs with not that much strength, this shotgun jabs are merely anime and cant be done like in the series.
gazelle jab is isaac pitbull cruz,iron mike irl and ippo in the anime, is a jab where you compress your body and then you let go all the strength like a spring, is more used with a hook than with a jab but still good.
smokin left is just a sucker punch with a lot of wind up.
irish handshake, i dont know where it comes from but is a illegal punch in boxing, while legal in mma with the back side of the hand, which follows an uppercut to the body.
roll combo is a technique used by issac pitbull cruz and mike tyson irl while ippo in the anime,
is the peek-a-boo style with the dempsey roll that is focused on moving the head in a infinite form motion to windup hook and uppers while dodging attacks.
razor smash is sendo from the anime low smash punch, he lowers his body to the point where his head is almost touching the floor while slipping/dashing, then throwing all his body up with an upper, just as shotgun jabs, is merely fiction and cant be done irl as in the anime.
rolling thunder is just an stronger dempsey roll (roll combo)
hitman right is thomas hearns chopping right (i think so)
roll is a non-orthodox defensive dempsey roll, is doing a circular motion while it is a infinite form motion
slip is just a movement technique
hustle taunt is muhammed ali shuffle
the burst is the same as irish handshake but without the upper, just the backhand punch

i dont know where rising and falling comet come from so i leave to you people.
thats all i can think of so ty for reading