I believe if you follow this method, it may be possible to take crota out with 2 swords... maybe even just 1. But to clarify, the sword combination needs to be rb, rb, rt, rb+lb. The uppercut does the same damage as a smash but does not have the ill effect of freezing you in place for 1 second. That same one second can be used to deal massive damage using the special. So try this out if you can, feel free to add some feedback, and let me know if you have any more tips for keeping your life up or dropping more orbs.