Use World or Mega for this fight.

We start the fight with 3 face punches, then countering his slide in the gut for a star, then block punching his 3 jabs. Make sure the stun punches are in the order, face, gut, gut. after that, 3 more face punches, then dodge his first uppercut, and then delay a punch for a star. Do this for his next uppercut, and right after getting that 3rd star, buffer the star punches into his next uppercut. He'll go down, and have a lower refill.

Phase 2 starts out the same as phase 1, except, at the end of the second pair of face punches, immediately buffer the star so he goes down. This is due to the lower health refill.

Phase 3 is simply phase 2, repeated. There is no variation, down to the star punch at the end

This was one of my earliest strategies, and this fight got me into speedrunning in the first place, so I'm glad I can get this guide out for ya'll to use.