I beat it but I don't particular remember that boss.
Taken from GFaqs:
Attacks: Thwomp Drop - Jump to avoid
Garbage Throw - Jump to avoid
Empties Garbage Bin - Jump to avoid
(Henchmen) Tackle - Attack with hammer
The boss' itself two attacks: thwomps and garbage. When he throws a rubbish
bin onto your head, he'll also throw a thwomp to drop on you. The brother
with the rubbish bin will run left and right, all you can do is jump and the
brother will jump straight up, thus sllowing you to (sort of) didge the
His garbage attack is much easier to dodge. First he'll throw a small piece,
which you'll jump and land on. Then he throws a bigger piece and you jump and
land on that aswell. This pisses the boss off and he runs at you. You need to
avoid him running into you.
The last few attacks are with his henchmen, the little rubbish bins. There
can be up to four henchmen in the battle at any time. The first is where
he'll grab one and empty out the contents. Depending on who he aims the bin
at, the contents will attack that brother. The following may be inside:
- Cheep Cheep: It'll run and jump over you, so you won't need to do
- Bob-omb: It'll run at you, land on it and it explodes. Jump to avoid.
- Scutlet: It'll run at you, but you can safely land on it to kill it.
- Rubbish/Underwear: It just drops...
The next thing he may do is vacuum up Luigi and throw him into one of the
bins. You have to find which bin Luigi is in and kill it to free Luigi. Each
bin has 105HP (157HP). But there's a catch! The bins will often shuffle its
contents and you'll have to see which bin Luigi is in. Sometimes Luigi will
tell you, so it's not too hard.
If you kill the correct henchmen and Luigi is inisde, he'll go back to help
you. But if you kill the wrong one, the monster inside will come to attack
you. Here's what's inside:
- Nooz: It'll float above you and drop on you, it'll pause a bit in mid
air to throw your timing off, so watch carefully and use your
hammer to knock it away.
- Chomp: It just runs at you, so use your hammer to knock it away.
- Fishbone: It circles around you, so use your hammer to squash it away.
The garbage henchman will also get a turn every round, but its attack is
really easy, it'll just run at you. If it sees your hammer, it'll stop and
close it's lid so you can't damage it. Put it away and it'll continue running
at you. What you need to do is to pull the hammer out at the last second and
hit him while he's stopping, but has not yet closed his lid.
Since the henchmen don't pose much threat, just attack the correct one when
Luigi has been taken, otherwise focus on the main boss itself.