Spoiler (click to reveal)
I kind of wish I had the amiibo that gives you free hearts. OTOH, I did learn a lot... You only have 3 health points, so you absolutely cannot afford to take hits recklessly.
I liked for pacing, the one broodal that gave me troubles was the first one (he's the green one with up to 16 hats, spin attacks with them). A "get him out of the way" type feeling
2nd one: the female who throws explosive mines at you that creates fire puddles... you learn how to deal with all of her attacks with very low to garuanteed no hits taken. Even found it if you can anticipate, with good timing, you can beat her sooner than later, bypassing many of those attack sequences
FOR THE FIRST TWO where you need to stomp on them as they run around, either jump ahead of time when they're about to lose their protective hat, or stun them by throwing your own. If you jump immediately after throwing, you'll hit them before they can run off again
3rd broodal: the one that vomits poising purple liquids all over... this one was actually a treat. I realized I can take him down swiftly. Thus, not having to worry about taking damage
4th broodal: throws hats that gets converted to trampolines if you hit them with your own hat. Stun his hat or 2, and make sure you time your jumps to be on top of his head (I may have ran into him instead, taking damage. Hard to tell from the camera angle), and that his hats don't boomerang back to him when you try to stomp him.
Final attempt, beat all 4 with only 1 hit taken!
Went into the next battle with full health since they do throw you a bone/heart
"Broodal-tron": You take control of a hammer bros. vs. this, so it's much easier to fight vs. having to flight the bombs back at it vs. the original battle. I seriously would've raged if I died here, after being soo close!