And here's the second boss from Wily Castle of MM4, Tako Trash. Basically, you have 2 options to fight this guy, one is from the moving platforms on the left side, and the other one is from the very edge of the top platform where the boss is located. We'll start with the moving platforms, since that's the easier option.
Easier, yes, however it's not Toad Man easy or Dive Man easy. It can be tricky. He's throwing big red balls on you, and it can happen at the time and place (depending on where the platform (with you on it) is at the moment) from where it's almost impossible to dodge a ball. Especially if it's the faster one (the balls come in 2 speeds, slower ones that come often and faster ones that come rarely but almost always tricky). It needs some practice so you can predict around when the faster one is coming, so you can prepare.
20 attempts, however it'd be even less, but I wanted to get a fight that's fun to watch.
There are many more Mega Man videos at my channel, feel free to check them out.