They can't be serious with the final boss!

[ZeldaGrossmeister]

I'm not sure why, but the final boss is insanely difficult! I've already died 8 times and I can't beat the second phase no matter what. This dude is so freaking random it's crazy!

And why the heck won't he drop any hearts? There isn't even a checkpoint after you've reached the second phase after climbing your way up. Which means if I die here, I have to do EVERYTHING again from the start? Why?!

Why do I have to start all over again? Just lower the difficulty of the final boss, this is ridiculous! Every other boss did drop hearts after one or two hits, but this one won't! Just why? And why can't you just place a checkpoint after climbing up?

I've just rage-quitted the game, because the final boss is no fun! F*ck this a**hole!

[Spiegel]

There is always a tell a few seconds before the attack and then i positioned myself at a spot that made it easier to avoid. Its the only way because as you said the attacks are always in a random order so cant learn the boss in sequential order.

Also not be too quick to pick up the bomb in the first stage because some attacks will hit you then.
Better to leave the bomb if unsure and try again next attack or first avoid and the pic kit up. The lasers were the hardest but they also can be avoided if first pulling them to a certain spot and then dashing past when they lock. Not easy by any means. The no damage is possible, i was so close but it will take many tries so i gave up.

[Andy Journey]

The boss picks from three potential attack patterns and he won't reuse a pattern until he has used all three. In each pattern he uses the same attack in the same order, so he is very much learnable.

To reiterate what Spiegel said: DON'T pick up the bomb immediately. Wait for him to do an attack first.