Here's a very quick summary for Ruby.
Enter the battle with one character alive, the other 2 KO'ed.
Have the character that's alive equipped with Hades, W-Summon, Mime and KotR (but you need to defeat Ruby to get that, so Bahamut ZERO will do) linked with HP Absorb. Have the character's ultimate weapon equipped and a Mystile. Ribbon/Protect Ring can provide some protection too.
Summon Hades to paralyse Ruby, W-Summon Bahamut Zero and Mime until dead. If Hades' effect wears off simply summon him again and resummon Bahamut ZERO.
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