Some people find it really hard to defeat the Alloys because of their extreme knock back and power. Fighting them normally is not he way to defeat them The only option left is to fight with the cheap style.

Cruel Brawl Tips

(Key: ! = Tested. * = Untested)

1. (!) Select Ike. When the Cruel Brawl begins, immediately run to the edge and grab ahold of it. The Alloys will follow you. Let go of the ledge and use the Great Aether to get back on the ledge. If one or two of the Alloys decide to jump or walk off of the stage while you do this, the Great Aether will push them further down below the level of the stage. Hopefully they won't be able to get back on the stage
2. (*) Use the same method as Ike. Go to the ledge, let go, and use your Up Special. The difference is that you have five jumps in total to get you out of any recovery trouble.
3. (!) Select either Kirby, King Dedede, Jigglypuff, or Pit. When the match begins, run to one of the sides of the stage and jump off. Stay as far away from the edge as possible. The Alloys will go to the edge of the stage. While you're off of the stage, you as many jumps as possible to stay off of it but don't over do it and fall off of the stage. While you are doing this, some of the Alloys might jump to you. When this happens, immediately head back to the ledge. The Alloys who jumped should fall off. Wait a second or two and then jump back off of the stage to do the same method. If none of the Alloys will jump, just head back to the ledge before your recovery runs out and try again.