The source of all things, or the All in All, is beyond Duality. All Duality is encompassed within this, as itself it is the source of Duality but also the transcendent of everything.
I myself do not have an antipode, neither do our people as people. What makes you think Satan would have an antipode, when even us humans do not have one? Why do you believe there should be such a thing, and why do you think the enemy must be their antipode? They are just a pest, they oppose us and they oppose certain things the Gods stand for or practice, this does not make them an antipode, and doesn't qualify them anything more than a pest. To us they may be an insurmountable force, to the Gods they are nothing.
Not for all things there has to be an opposite duality. Either some things inherently do not have them, or some beings are beyond this altogether for this to be possible.