I shared this in the Power Rangers speedrunning Discord, but in looking for good strats against Ivan Ecto M. at higher difficulties, it looks like j1+2 is the answer.

Recorded on Hard difficulty:

Notes:

• Jumping right as he stands up after getting hit and having him block the glide /almost always/ results in him uppercutting, which you can glide into and repeat, as you see here.
• After throw, if you immediately glide past him, he will /always/ use the dashing slash special, which you can hit him for doing (as you see me do) by just gliding again.

Between these two 95% guaranteed behaviors and the fact he will almost always uppercut after blocking a glide, he becomes pretty much a flowchart to fight and shouldn't be hard to defeat consistently.

Thanks for sharing this, very interesting to see this confirmed here. I think that many of us had unconsciously noticed its Sho-Ryu-Ken when passing behind, but now it is confirmed with this video. What I used to do when he is stuck on ground and if I am on a pressure position on him, I try a combo "punch then multi punch", he takes everything or at least the last punch of the serie.

EDIT : when I was writing my comment I had forgotten that it is in HARD in the video.