Cruel Brawl is a cinch. Pit has the easiest time of it. Run off, jump a couple times, Up-B to recover, grab the edge, use your A to attack as you get back on, rinse, and repeat. The alloys will just suicide off the edge. Zero Suit Samus can do a decent job of it too, though I find with her it's better to switch sides each time you jump off. Just watch out for the Green Alloys, as they will use Kirby's Air Down-A if they are directly above you.