Just throwing these here as possible timesaves, or in case someone wants to do some sciencing.
So I was playing around with Chortlebot and accidentally clipped through his orbs as they were spinning, getting me stuck between them and the boss, effectively knocking him down in one hit. I sorta got through them in the bottom-right portion. Have not been able to find a setup for it.
There's also a way to ground pound on the Shake King twice as he does a dash, saving time on the second phase and cloud phase. It seems really precise; if you're late it's fine, but if you're early then he gores you. Again, I haven't found a good setup.
Did not get the Chortlebot one on stream, but I've got an old video with the Shake King thing - I tried my darndest to make a setup for it but there's really nothing obvious. Somehow I got it while looking for a setup first time, but it was another once-off fluke.
(25 secs in)