How do you defeat the Digimon Observers?

How do you defeat the Digimon Observers, Azulongmon, Ebonwumon, Baihumon and maybe Zhuqiaomon. I tried to defeat Azulongmon 3 times at the Sky Palace and the result is always a loss

You need to have a high level, to get really high you need to degenerate a few times and work your level back up. And try to get all of your Digimon to the Mega form. And use attacks that hit more than 1 zone. If you have WarGreymon & MetalGarurumon they have the moves Terra Force & Metal Wolf Claw, respectively. Those 2 moves hit all 5 zones, so they are good choices.

Actually, for a quick death, use ultamite lvl digimon, but have Phoenixmon, his crimson fire, I think it was does three spots and you can also get him in Sky Palace! That's what I did! Good Luck!

Any advice on Embonwumon? I got a:
Level 40 HolyAngemon
Level 40 Phoenixmon
Level 39 Lillymon
Level 43 Zudomon
Level 20 Greymon(Degenerated it to get WarGreymon)
Level 40 RiseGreymon