Czar Dragon...
Take Mallow and Bowser. Ask me if you should use the Snowy.  
....

Yes, yes, YES!!  FOR THE LOVE OF ALL THAT IS GOOD AND RIGHTEOUS, USE THE SNOWY!

...This hot-head can only take so much ice and snow! Fire clothing proves quite useful. Bowser still has the Spiked Link, but Mario & Mallow have all new weaponry from Nimbus Land--the Mega Glove and the Sticky Glove. Mario just might have the Lazy Shell. If he does, forget the armor for now and just give him the weapon! One final piece of pre-dragon advice: Don't ever use flame attacks. DUH. The live Czar Dragon is no big deal, but Zombone, his ghost, can be quite a handful. If you run out of FP don't bother charging back up unless you need an HP rain. Just go it the rest of the way with regular attacks. And as soon as he kicks it, switch your team to Mario, Geno and Toadstool, who have the Hand Cannon and War Fan, and go back across the Donut Block bridge. I know it takes forever, but go back and save before proceeding! Don't ask questions, just do it! Now, go ALL THE WAY BACK and push on towards life, liberty, and the pursuit of Star Pieces...