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Creepy Pokémon Theory. What if the Shadow Pokémon are Shadow Revenants?

To any of you had encountered a lot of Shadow Pokémon in Pokémon GO, what if the Shadow Pokémon are not corrupted by Team GO Rocket, but used to be actual Pokémon that suffered such a horrible fate as they lost their lives to some cruel and unjust twist of fate? These former Pokémon are mysteriously resurrected through dark magic by a mysterious malevolent force and are so tainted with heartless evil that it had their experience, friendship with trainers, movesets and CPs removed from them, as if they are seeking revenge on Team Rocket and the Pokémon League for what horrific twists of fate had befallen these former Pokémon.
When defeated, the Shadow Revenant Pokémon let out a final scream of despair as their bodies materialize into dried clay crumbling and disintegrates into dust. Their souls leave their lifeless bodies as they are banished to the dark depths of the Netherworld below for eternity.
Sounds like some kind of a heartbreaking, yet horrifying situation!😨