How about a Satan/Lucifer type demon where its pre-evolution is an angel
I can't believe I'm saying this but keep your SMT out of my Pokemon.
Satan and Lucifer are much further than SMT, like during the Iron Age when the serpent tried to make Eve eat the fruit, then during the Roman Empire when John of Patmos spoke of Satan as lightning falling from Heaven
Trust me, I know a lot about mythology (Judaism specifically) and SMT (especially the main series, I &II)
The Official Melchizedek of the Shin Megami Tensei IV board