Is there an "easy" way to defeat the General of Lust in this part of the RPG? I can't defeat him at all, even when I freeze time in celestial form, it It's over, he'll regenerate.
This may become available as part of the story, once you've progressed far enough. Some of the components will be given to you by Selena herself when you visit the Dream World, and others can be found in L's shop. This can be determined by the suit's appearance in the tailor's catalog. See the images added by user Chin_Alancia.